Munich - FC Bayern Munich's joy at defeating Juventus in their UEFA Champions League quarter-final first leg has been tempered by the news that midfielder Toni Kroos will be out for up to eight weeks after tearing a groin muscle.

The 23-year-old Germany international began Tuesday's 2-0 win over Italian football's 'Old Lady', but was replaced after just fifteen minutes by Arjen Robben.

Bitter blow

"Six to eight weeks out" was the diagnosis given by Dr. Hans-Wilhelm Müller Wohlfahrt, the club's chief medical officer after examining who pulled up suddenly after attempting to close down a pass from Juventus' Swiss defender Stephan Lichtsteiner.

For head coach Jupp Heynckes, the injury took some of the shine off what was an evening of triumph for the Reds: "It's a very bitter blow, for him and for us all. We're coming to a decisive phase in the season and it looks like he will be out for a long time."