Michael Ballack could be doubtful for Bayer Leverkusen's visit to Champions League Group E opponents Valencia after fracturing a bone in his nose during the 1-0 Bundesliga win over rock-bottom Freiburg on Friday.
Ballack scored the only goal of the game after just two minutes to boost his side's flagging league campaign, only to forced off in the 65th minute after a clash with Freiburg's Jan Rosenthal.
The injury has placed doubt over the former Chelsea and Bayern Munich star's participation in Tuesday's clash at the Mestalla stadium, where the hosts will be looking to claw back their current deficit.
At the group's halfway stage Chelsea sit top on seven points, with Leverkusen second on six and Valencia third on two. Belgian side Genk sit bottom with a point.