Kai Havertz must improve against Liverpool after the £86million newcomer flopped on his Chelsea debut and appeared not to care.

That’s the verdict of Arsenal legend Paul Merson amid speculation Germany attacker Havertz might be dropped to the bench at home to the champions on Sunday afternoon.

Havertz was replaced by Callum Hudson-Odoi in Chelsea’s Premier League opener, Monday’s 3-1 win at Brighton.

And Merson questioned not only the ex-Bayer Leverkusen hero’s display but also his attitude.

The former England striker wrote in his Daily Star column: “Kai Havertz has got a lot do. He didn’t play well.

“He didn’t even look interested at times. When he came off, he didn’t really seem to care. It was strange.”