Alexander Isak, Bojan KrKic and Neven Subotic (l-r.) are among the biggest transfers of the winter transfer period.
Alexander Isak, Bojan KrKic and Neven Subotic (l-r.) are among the biggest transfers of the winter transfer period.

The transfers that will rock the Rückrunde

With the winter transfer window now firmly shut, cherry-picks the done deals that could have a major impact on your team's success in the Rückrunde.

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Ooh-la-la factor: Paul Georges Ntep (VfL Wolfsburg) Ever since Franck Ribery successfully made the transition from Ligue 1 to the Bundesliga in 2007, players who have cut their teeth in the French top flight have been all the rage. Ntep's style bears more than a passing resemblance to that of the FC Bayern München man: direct, exciting, one that lifts crowds off their seats and wins their team matches. Look out Wolfsburg fans! Ntep's va-va-voom means it will be a thrill-a-minute ride.

Out of Left Field: Yunus Malli (VfL Wolfsburg) With six goals and seven assists as an ever-present in 1. FSV Mainz 05's Hinrunde, Malli looked poised for another stellar season at the OPEL ARENA. Julian Draxler's departure changed that, prompting Wolfsburg to come a-calling for one of the Bundesliga's most consistently creative players. It is a move that raised eyebrows, but for the Wolves' main striker, Mario Gomez, it is his spirits that will have been lifted at the tantalising prospect of the service Malli can provide.

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Watch: Malli makes mincemeat of Freiburg, with a goal and two assists on Matchday 11:

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The Barcelona graduate: Bojan Krkic (1. FSV Mainz 05) Malli's departure left a void in attacking midfield and who better to fill it than a player who learned his trade alongside Lionel Messi? Krkic has experience of playing in Spain, England, Italy and the Netherlands, and his skill, dribbling ability and eye for a pass could soon make him into a fan favourite at the Carnival Club.

The Dark Horse: Thomas Delaney (SV Werder Bremen) Switching from FC Kobenhavn, the juggernaut of Danish football where Delaney had played since childhood, to one of the Bundesliga's sleeping giants will be a radical change. But the 25-year-old, who owes his Irish surname to a New York-bound 19th-century emigré from the Emerald Isle, had little trouble in stepping up to the standard of the UEFA Champions League earlier this season, and should take to Germany like a BunDucksLiga to water.

Renaissance Seeker: Holger Badstuber (FC Schalke 04): The Germany international centre-back had made just 18 Bundesliga appearances for Bayern in the last two-and-a-half seasons, including just one this term. His progress stunted by injury upon injury in recent years, Badstuber has swapped Bavaria for Gelsenkirchen in a bid to revive his career by spending more time on the pitch than the treatment table. With his Bayern contract up at the end of the season, the 27-year-old will be doubly motivated to impress.

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The Bargain: Timothee Kolodziejczak (Borussia Mönchengladbach) He has opted for 'Kolo' on the back of his shirt, prompting sighs of relief from football commentators around Germany, but the French defender's CV is almost as impressively long as the Scrabble triple-word-score surname his Polish father gave him. Rated as one of his country's hottest prospects as a youngster at RC Lens, he joined Ligue 1 heavyweights Olympique Lyonnais and helped OGC Nice establish themselves in the top flight before winning two UEFA Europa League titles at Sevilla FC. The Foals can pat themselves on the back for adding a genuine thoroughbred to their stable.

Redemption Day: Sidney Sam (SV Darmstadt 98) The explosive talent that burst onto the Bundesliga stage at Hamburger SV and then shone again at Bayer 04 Leverkusen has had some of the shine taken off it in three underwhelming and turbulent years at Schalke. Bottom-of-the-table Darmstadt need a saviour, and Sam, who turns 29 later this month, could be their messiah if he can reproduce the performances that earned him caps for Germany.

Second chance: Neven Subotic (1. FC Köln) Subotic was a rock at the heart of the Borussia Dortmund defence during their title-winning Bundesliga campaigns in 2011 and 2012, so the Billy Goats have recruited a hugely-experienced campaigner who knows what it takes to succeed. Injuries have restricted his appearances in recent months - the 28-year-old last featured in the Bundesliga on 2 March 2016 - but with a few games under his belt, Subotic could prove to be a valuable asset in the second half of the season.

Rough Diamond: Dayot Upamecano (RB Leipzig) Ralf Rangnick's ability to unearth gems has been proven time and again, and the Leipzig sporting director's latest fresh-faced discovery could enhance that reputation still further as the 18-year-old French defender has talent to burn and time on his side. Not all of the seven players who previously made the step from FC Salzburg to Leipzig have been successes at the Red Bull Arena, but as his new coach, Ralph Hasenhüttl, said: "He has every opportunity to provide us the qualities we need."

Click here for an overview of each club's winter transfer activity