Chelsea boss Frank Lampard admits Hakim Ziyech's injury absence has forced a change of system.

It comes amid a mini-injury crisis for the Blues who have all their wingers out injured at the moment.

Christian Pulisic, Ziyech and Callum Hudson-Odoi have all had similar hamstring problems.

When asked about Pulisic, Lampard said: "He was out for injury with his hamstring.

"He trained on Saturday. He's in the squad for tomorrow but we are yet to decide if he will start or not. It is positive news from the weekend."

But there was less enthusiasm over Ziyech, who has had a stop-start campaign with injuries as well.

When asked if Chelsea will adapt their tactics due to the lack of wingers, Lampard said: "Not in the short-term no. We are playing well.

"Hakim has been pivotal and suddenly we're short on wingers. It's not the formation at the weekend - it was the way we executed. We have players to comfortably do that."