The summer transfer window has been flung wide open and Bundesliga clubs have not been shy about poking their heads out and coveting members of their rivals' squads. With that in mind, bundesliga.com has put together a best XI of the league's new signings.

Goalkeeper

Lukas Hradecky (from Frankfurt to Leverkusen)

Aware that Bernd Leno's time at the club was coming to an end after seven years, Bayer Leverkusen moved swiftly to secure the services of one of the most reliable stoppers in Germany, sealing Hradecky's transfer just two weeks after the conclusion of the 2017/18 season.

That they were able to sign the Finland No.1 on a free transfer makes it an even better piece of business, but the lack of a price tag was far from the only reason for their pursuit of Hradecky. The 28-year-old did not miss a single minute of Bundesliga action last term and helped Eintracht Frankfurt finish eighth, as well as lifting the DFB Cup. With Leverkusen back in Europe this term, his experience in high-pressure games will come in handy.

Watch: Hradecky's best saves in the Bundesliga

Defenders

Mitchell Weiser (Hertha to Leverkusen)

Leverkusen sporting director Rudi Völler can give himself another well-deserved pat on the back for completing this deal so early in the summer. Having identified a need to give Benjamin Henrichs some competition for the right-back slot – Tin Jedvaj and Lars Bender have been filling in out of position – hindsight will almost certainly prove that swooping for Weiser was a stroke of genius.

The 24-year-old has two Bundesliga medals and a DFB Cup success on his CV from his time at Bayern Munich, while he also scored the winning goal to fire Germany to glory at the UEFA European Under-21 Championship last summer. Quick, tireless and always willing to get forward, Weiser contributed a goal and two assists in an injury-plagued 2017/18 season for Hertha Berlin, and can also play in midfield or as wing-back.

Salif Sane (Hannover to Schalke)

"What's better than having one powerfully-built, six-foot-something centre-back who can score? Having two of them!" Is probably how the conversation between Schalke head coach Domenico Tedesco and sporting director Christian Heidel went earlier this year. While Naldo was arguably in the form of his life in 2017/18, there is an acceptance that, at 35, he will be unlikely to continue in the same vein for too much longer. Which is where Salif Sane comes in. 

Eight years younger than his soon-to-be defensive partner, the Senegal international is an imposing figure, and won more aerial duels (225) than any other player in the Bundesliga last term. That went a long way to ensuring a newly promoted Hannover side avoided the drop, and the fact he also scored four goals and provided one assist is an added bonus. At the stroke of a pen, Schalke have just become twice as dangerous at set-pieces.

Abdou Diallo (Mainz to Dortmund)

What is it with Borussia Dortmund and ball-playing centre-backs? After losing Mats Hummels to Bayern a couple of years ago, BVB finally appear to have found a long-term replacement in a similar mould: Abdou Diallo. 

The former France U21 captain excelled in his maiden Bundesliga season in 2017/18 at Mainz, starting 27 games and playing a leading role in the side's survival. "He's a modern player who's good on the ball and is a very intelligent centre-back," said Dortmund sporting director Michael Zorc of the newcomer. "He can also play at full-back or in defensive midfield. This combination of potential and versatility is what made him so interesting to us."

Diego Contento (Bordeaux to Fortuna)

Whisper it quietly, but Fortuna Düsseldorf might just have pulled off one of the best signings of the summer. Contento, a left-back, learned his trade at Bayern, where he made 49 Bundesliga appearances and 11 UEFA Champions League outings before joining Bordeaux in 2014 in search of more regular first-team football.

Brought in on a two-year deal following a free transfer from the Ligue 1 side, the 28-year-old is a solid defender who likes to bomb forward down the left flank. "He's a great full-back, both in terms of defence and attack," said Düsseldorf head coach Friedhelm Funkel of his new signing. "His experience means he knows exactly what is required in the Bundesliga and his ability and character make him a good fit for our team."

A Bayern youth product, Contento was part of the team to win the 2013 treble during his almost two decades with the German record champions. © gettyimages / Christof Stache

Defensive midfield

Thomas Delaney (Bremen to Dortmund)

Over the last few years there has been a sense – rightly or wrongly – that Dortmund have had a soft middle, lacking a hardened midfield enforcer to complement the dazzling technique on display elsewhere in the side. That is no longer the case. Delaney enjoyed an excellent 18-month spell at Werder Bremen, whom he joined from serial Danish champions FC Copenhagen as he sought a fresh career challenge.

It is no exaggeration to say he excelled at the Green-Whites, his superb positional play and strength in the tackle – only Augsburg's Caiuby won more challenges than Delaney's 432 last term – helping a mid-table Bremen side concede just 40 times, a record bettered only by the top two of Bayern and Schalke, and Stuttgart. He also posted three goals and four assists at the other end of the pitch, while his UEFA Champions League experience with Copenhagen will stand Lucien Favre's men in good stead in 2018/19.

Omar Mascarell (Frankfurt to Schalke)

Any player to come through the Real Madrid youth academy is bound to have a good grounding in the game, and Omar Mascarell is no different. The 25-year-old defensive midfielder arrived at Eintracht in summer 2016 and immediately dropped jaws with his technique, eye for a pass and superb positioning.

"Omar, for me, is a poem," enthused former Frankfurt coach Niko Kovac of the Spaniard. An Achilles injury reduced him to just nine league appearances in 2017/18, but such was his quality and influence on Frankfurt's game that even that was enough for Schalke to pounce.

Mascarell won the DFB Cup against Bayern Munich in his last match for Eintracht Frankfurt. © gettyimages / Tobias SCHWARZ

Attacking midfield

Marius Wolf (Frankfurt to Dortmund)

Another player to reap the benefits of Kovac's meticulous eye for detail is attacking midfielder Marius Wolf. After spells in the second division, his career appeared to be petering out in the Hannover reserves before Frankfurt recognised an untapped talent last summer.

In just one season under Kovac, Wolf was transformed from wannabe winger into bona fide Bundesliga danger man, his pace, directness and much-improved decision making causing problems for defences up and down the country. He ended the season with five goals, eight assists and a queue of clubs wanting his signature.

Leon Goretzka (Schalke to Bayern)

Surely the last thing Bayern need is another central midfielder, isn't it? Thiago, Arturo Vidal, Sebastian Rudy, Corentin Tolisso and Javi Martinez are already there, so there is clearly something very special about Goretzka for the record Bundesliga champions to want him in their stable.

An energetic player with a graceful stride that masks a biting tackle, the 23-year-old is highly effective at both ends of the pitch and has developed into a full Germany international in recent years. He proved his worth at international level by spearheading Die Mannschaft's triumphant 2017 Confederations Cup campaign, and when it became clear Goretzka would not extend his stay at Schalke, Bayern wasted no time to get their man.

Watch: Goretzka's journey to Munich

Leonardo Bittencourt (Cologne to Hoffenheim)

Hoffenheim may have lost attacking duo Serge Gnabry and Mark Uth this summer, but the arrival of Leonardo Bittencourt will go a long way to mitigate their departures. Combining pace, trickery and an internal compass that always points towards the opposition goal, the 24-year-old, who been set back by injuries in recent years, will get his chance to shine with Hoffenheim both domestically and in the Champions League in 2018/19.

Persistent hip and adductor problems limited Bittencourt to just 17 Bundesliga starts for Cologne last season, his return of five goals and two assists hinting that relegation could perhaps have been avoided if he had been fit throughout the campaign.

Striker

Mark Uth (Hoffenheim to Schalke) 

It took Mark Uth a while to find his feet as a footballer, but after arriving at Hoffenheim - his fourth professional club – at the age of 23 in 2015, the German striker has flourished.

A ruthless finisher with a deadly left boot, Uth was top scorer for Julian Nagelsmann's side last season with 14 goals, as well as contributing seven assists. Now well and truly at home in the Bundesliga, the prospect of him improving even further under Tedesco bodes well for Schalke.

Watch: Uth's top 5 goals

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