That is the opinion of ex-Blues left-back Scott Minto, who was speaking about the French midfielder's future.
Kante wants to get a new four-year deal to convince him to stay at Chelsea for the rest of his career.
However, Minto believes that Kante is too injury prone to justify such a deal.
Minto told talkSPORT: “He's 31, he's a superb player and when he's fit I still don't think there's anyone better. You go back to that Tottenham game where Chelsea outplayed Spurs and Spurs nicked it, he was absolutely superb.
“But one, he's not always fit, and two, when you're the wrong side of 30, I don't think you can ask for four-year contracts. You simply can't, you get a two-year at best.
“So if he's demanding that and it's that or nothing, then I think Chelsea have to let him go."