Chelsea boss Andre Villas-Boas admits concerns over Ramires' knee injury.

The Brazil midfielder was forced off during their FA Cup win over QPR.

"[Ramires] looks like a medial ligament injury, not so bad in terms of knee injuries. He will have an MRI tomorrow and we will know the full extent. Hopefully he will avoid an operation and be back soon. We could look at four weeks, but we have to know the extent of the injury to give a good assessment," said AVB.