"I'm not too concerned, really," Lampard said. "He's probably the best player in the world having achieved what he did last year - you can't take that away from him. But whether after a few months out they'll put him back in, I don't know. "If they do we'll have to deal with that. We're good enough to deal with United at their strongest - we shouldn't want them weak. If they are strong we still want to beat them."