London  - Arsenal forward Theo Walcott is likely to be out for several weeks after injuring his knee in training on Friday.

Walcott will miss Arsenal's Premier League trip to Newcastle United on Saturday, and is almost certain to be out of England's friendly against Slovakia and the World Cup qualifier against Ukraine four days later.

"He will have a scan on his knee today and we are a bit surprised and worried because he was in very good form coming back," said Arsenal boss Arsene Wenger.

"Out for the rest of the season would be too long, but certainly he is out of the squad for the Newcastle game tomorrow and he could be out of the squad for England.

"Theo locked his knee when he was walking back from training, so it could be a cartilage.

"Training was fully normal and maybe he has done it in training and it came out when he stopped." (dpa)