England prop in doubt for 6 Nations
London Irish boss Brian Smith revealed serious concern for England prop Alex Corbisiero after his side's 18-12 win over Gloucester.
Corbisiero pulled out in the captain's run before the trip to Kingsholm, with Smith describing his knee problem as a "degenerative condition" that could rule him out of Irish's upcoming fixtures and the Six Nations.
Corbisiero started England's recent Tests against South Africa and New Zealand, but he faces a race against time to make the Six Nations kick-off against Scotland at Twickenham.
"It is very frustrating for us, it is very frustrating for 'Corbs'. It is a tough time for him, and it is a difficult one to balance," said Smith.
"His knee is a mess. He has played one-and-a-half games for us this season, and it is very disappointing.
"Sitting here right now, I couldn't tell you if he is going to play next week or not. He has got degenerative knee issues. He trained twice this week. We are bringing him back, and then at the captain's run he pulled out prior to it, and we had to make a change.
"There is not much of a decision to make when a bloke's knee has blown up and he feels he can't play. You can't put a gun to his head and tell him to get on the paddock.
"He is an honest person, he is a good bloke. He desperately wants to play for us, but it is a very frustrating situation."