Speaking to Spin Genie, who offer the latest jackpot slots, Nevin said: "I've said before that centre-backs don't come into their own until they turn 24, 25 or 26. Levi Colwill is 22 and has everything you want in a defender. Chelsea must stick with him in their current model.
"Someone like Marc Guehi is coming into his prime at 24. Would I like to see him partnered with Colwill? Oh yes, definitely. I would love to see that. I've been saying for quite a while that Dean Huijsen is one of the best defenders in the world and, if I were Chelsea, he would have been the one I would have gone for. I thought he could replace Virgil van Dijk at Liverpool, so I was surprised to see him end up at Real Madrid.
"The other defender Chelsea need to consider signing, and I don't want it to happen, is Jarrad Branthwaite. He's young, but acts way beyond his years, and is growing into something special. Out of all the current defenders out there at the moment, I think he's the closest there is to John Terry when it comes to leadership and his style of play. My Evertonian hat hopes it will not happen though."