"Sylvain has done a good job for us. We are delighted," Moyes told evertontv. "We need to try and keep our players. A lot have of these have been here for a few years now, Sylvain has and he deserves his new one-year contract.
"His performances since he came here have been excellent. He's reliable, doesn't miss many games with injury, keeps playing and certainly keeps himself in great condition.
"He's a real physical specimen when you see the work he does behind the scenes, so from that point of view he is very good for us and I'm delighted to keep him.
"You are always looking to bring in new, fresh, young players because you always look to the future. But, coupled with that, you need to keep experience, in central defence especially.
"More and more it's becoming an experienced position but now it's even more so than in the past. His experience is vital to us."