Dorgu impressed in the first two matches of Michael Carrick's time in charge, where he scored both against Manchester City and Arsenal.
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However, he was hit by injury and is currently recovering from a serious hamstring injury.
Lammens told Viaplay: "He's a great talent and I think people forget how old he really is - I did.
"He has a lot to learn yet, but the talent is clear and he's so good a guy. I hope he comes back strongly."
This season, Dorgu has played 24 matches, scoring three goals and making three assists.
