The 23-year-old joined Man United in the latter stages of the summer transfer window from Belgian side Royal Antwerp for a reported fee of around £21 million.
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Since then, Andre Onana has been shipped out of the club, joining Turkish side Trabzonspor on loan for the rest of the season.
Ruben Amorim has made sure not to rush Lammens in to such a high-pressure position and he is yet to make his debut for United.
According to BBC Sport, the Belgian has impressed his new coaches and is already getting used to his new surroundings.
He has already moved out of temporary hotel accommodation, which staff view as a positive step in his settling process in England.