Marca says United are eyeing Lammens over doubts over Andre Onana's future.
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With the Cameroon international to miss the start of the season due to a hamstring injury, Marca says United are seeking a new keeper signing.
A move for Emi Martinez has been rejected by Aston Villa after United sought a straight loan arrangement.
While talks continue with Villa, United have also made contact with Antwerp for Lammens. For the moment, no formal offer has been made.