Serhou Guirassy joins Borussia Dortmund on €17.5m deal from Stuttgart, clause triggered.

Guirassy, 28, has signed a four-year contract at the Westfalenstadion on the back of an impressive season in which he netted 30 goals in as many games.

He is unlikely to be the last arrival for Nuri Sahin’s new-look squad, with Sky Germany reporting that Pascal Groß and Rayan Cherki are likely to follow.