Cologne – With the 2015/16 Bundesliga season just around the corner, we figured it prime time to take a closer look at some of the German top flight's most talked about summer signings.

The 18 top-flight clubs have been working hard on improving their squads for the upcoming campaign and bundesliga.com is looking at the potential transfer hits of the summer. The latest deal to go under the microscope is Gonzalo Castro's move from Bayer 04 Leverkusen to Borussia Dortmund.

Time for a change

On the Leverkusen books for 16 years, Castro, a Bayer 04 youth product, made over 280 Bundesliga appearances for die Werkself, scoring 25 goals and setting up a further 63. Those stats alone show how creative he is and why Dortmund were so keen to bring the German to the Signal Iduna Park.

Indeed, with Sebastian Kehl hanging up his boots, there is a void in defensive midfield seemingly with Castro's name all over it. The 28-year-old faces plenty of competition, mind, with Ilkay Gündogan, Shinji Kagawa, Sven Bender and Julian Weigl all vying for potentially only two positions.

Castro's strength: pinpoint-passing ability

Interestingly, Castro was Bayer's biggest assist provider (seven) after Karim Bellarabi last season. By comparison, not a single Dortmund player laid on so many goals in 2014/15. In that respect, he has a major advantage over his peers when it comes to nailing down a starting berth at new club BVB.

Above all, though, Dortmund are going to benefit from the way Castro reads the game. He is able to play the most pinpoint of passes even under pressure, always succeeding in getting his team-mates into good shooting positions. His dangerous set-pieces are also going to add another string to BVB's bow. Furthermore, he is brilliantly versatile – a characteristic held in high regard by new head coach Thomas Tuchel.