Barcelona says Chilean forward Alexis Sanchez has strained a muscle in his left leg and is a doubt for Sunday's Club World Cup final in Japan.

Alexis replaced David Villa, who broke his left leg, in Barcelona's 4-0 win against Al-Sadd in the semifinals Thursday, but had to be substituted before the end of the match because of the injury.

Barcelona says Alexis missed training Friday and will be evaluated ahead of the final against Brazil's Santos in Yokohama.

The club also says Villa has arrived back in Barcelona, where he will undergo an operation.