With just over two months until the 2010 FIFA World Cup South Africa™, England's star striker Wayne Rooney sustained an ankle injury on Tuesday at the end of Manchester United's UEFA Champions League clash with Bayern Munich.

Rooney, one of the world's top players this season with a stunning 34 goals for United, hobbled off from the Allianz Arena in Munich following a clash with German international striker Mario Gomez. The injury is not just bad news for England, but also for club side United who face title challengers Chelsea in the English Premier League on Saturday.

Let's hope it's not too serious. He may be doubtful for Saturday. It's too early to say. He's being treated by our medics at the moment. We'll see what it's like tomorrow.

Sir Alex Ferguson on Rooney's ankle

The knock capped a disappointing evening for United, who led for long periods of their Champions League quarter-final first leg before being stunned by two late goals from the German giants.

Rooney sustained an injury a few months before the previous FIFA World Cup finals in 2006, and, while he played, he had a disappointing tournament.

United manager Sir Alex Ferguson said: "He's got a kick in the ankle, we'll just have to see tomorrow (Wednesday). Let's hope it's not too serious. He may be doubtful for Saturday. It's too early to say. He's being treated by our medics at the moment. We'll see what it's like tomorrow."