The Belgian goalkeeper has arrived from Royal Antwerp to compete with Heaton and Altay Bayindir for the senior keeper's place at United.
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"It's only been a few days training but he seems like a really good lad," Heaton said on the Training Ground Guru podcast.
"He's calm but a strong personality.
"His goalkeeping fundamentals are very impressive and I think I said that to him after a couple of days training.
"Twenty-three years old coming into Manchester United, first few days training and he's been very impressive so far. I really like his goalkeeping fundamentals."
