The interest in Lammens comes as there are doubts about the future of Andre Onana. Onana, a Cameroon international, will miss the start of the season due to a hamstring injury.
Manchester United had previously tried to sign Emi Martinez from Aston Villa, but the club rejected a loan offer. Talks with Villa are still ongoing.
Meanwhile, Manchester United has made contact with Royal Antwerp to discuss the possibility of signing Lammens. No formal offer has been made at this time.
