Central defender Daniel Van Buyten is unlikely to feature in the second leg of FC Bayern München's first knockout round tie against ACF Fiorentina after tearing a calf muscle in Wednesday's opener.

The Belgian international was replaced by Diego Contento at half-time, as Bayern went on to win the game 2-1. Head coach Louis van Gaal did not know for how long the 32-year-old would be out of action, but said: "He will definitely not be available against Nürnberg [this weekend] and might not be able to play Hamburger SV a week later."

The UEFA Champions League tie concludes in Florence on 9 March, with Holger Badstuber likely to move across into the central defence in the event that Van Buyten does not recover. Goalkeeper Hans-Jörg Butt said: "He has done so before in the first months of this season, so this is a good solution." Miroslav Klose added that losing Van Buyten was "a bitter blow".