The Red Devils have been in the market for a new No.1 throughout the summer, with Andre Onana failing to convince across his two seasons as first-choice at Old Trafford. Back-up keeper Altay Bayindir has also made mistakes when called upon.
That agreement is said to be worth £18m plus add-ons, with the 23-year-old heading to England for a medical after agreeing terms on a five-year contract. Lammens has made Belgium squads in the past, but is still waiting on his senior international debut.
WHAT NEXT?
It remains to be seen what the future now holds for Onana, who made more unfortunate headlines in the wake of United’s Carabao Cup humbling at Grimsby. Martinez also has some big decisions to make after missing out on a move that he considered to be highly likely.