Former Chelsea midfielder Steve Sidwell says they must try to keep hold of Toni Rudiger.
The 28-year-old will be free to talk to overseas clubs in the New Year, with Real Madrid and Paris Saint-Germain vying to land him on a free transfer at the end of the season.
Sidwell admits Rudiger is irreplaceable: "He's really stepped up to the plate not only defensively but on the ball as well.
“Some of the drives out for the ball to come out and start attacks for Chelsea. If they let him go, who do you replace him with? He's invaluable.
“He can play passes forward - he ventures forward when he needs to.
“Defensively the last few games he's slipped. He's let runners go and let's his go of his position quite a lot. But when he's on it, there's no one better in the Premier League."
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