Out-of-form Yuvraj Singh twisted his knee on Thursday during the warm-up session and is being examined.

Yuvraj hurt his knee in the morning practice session before the start of second day's play of the third Test against Australia and it is still not certain how serious is the injury, according to India's media manager M V Sridhar.

Yuvraj has had a nightmarish tour, failing in the first two Tests, as well as in the side game at Canberra, and was made to sit out in the ongoing Test.

There was a little concern on VVS Laxman's ankle but Sridhar allayed any fears.

Sourav Ganguly went for a check up from the ground in the morning but according to Sridhar the left-hander is fine and it was a routine check up. Apparently, the cough in his chest is still giving Ganguly a bit of trouble.