Dortmund - Ilkay Gündogan is likely to be unavailable to Borussia Dortmund for the next two weeks with a spinal sprain aggravated playing for Germany in Wednesday's 3-3 draw with Paraguay.

BVB club doctor Markus Braun said Gündogan's symptoms had worsened in the aftermath of the friendly international in Kaiserslautern, where the 22-year-old midfielder scored Germany's opener to pull them back to 2-1 against the South American visitors.

had played the first 57 minutes of Dortmund's 4-0 Matchday 1 win at FC Augsburg on Saturday after having been a doubtful starter due to a back problem.