Germany international Antonio Rudiger is not good enough to play for Chelsea, according to former Blues goalkeeper Mark Schwarzer.
Rudiger has returned to the Blues' backline in recent days after Frank Lampard preferred to partner Thiago Silva with Kurt Zouma earlier this season.
However, Schwarzer has admitted he has been surprised by Rudiger's return to the club's starting XI as he feels the Germany star is "not good enough" for a team of the Blues' calibre.
"I'm very surprised Rudiger is back in the side because I don't think he's that great a defender," the retired goalkeeper told Stadium Astro.
"I don't think he's good enough to play for Chelsea. I think he has had enough opportunities.
"Yes, last season or the season before he had a lot of injury issues, but I think Kurt Zouma next to Silva is the best combination. They showed a couple of weeks ago how good they are together.
"They are going to have a dip in form sometimes but I'd look to keep it simple, play a way into form.
"(Andreas) Christensen, I think, is a good player to have there or thereabouts if you need him. (Fikayo) Tomori as well, I would play him ahead of Rudiger. I'm surprised that Tomori is out of the side altogether."