The defender hasn't been seen since before Christmas due to a back injury.
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Carrick says the Holland defender is now back on the training pitch this week.
He confirmed: "In terms of Matthijs, he’s working towards being fit again. He's doing a little bit on the grass and it's progress, but there is not much else I can say.
"It's one of those injuries and he's rehabbing, he's working to get fit. So we're hoping to have him back as soon as possible. There is not much I can add on that."
On surgery, Carrick added: “He's back on the grass at the moment, in a small capacity, but he's working towards it. So that's positive, so yeah, we're all hoping that it keeps going in that direction.”