Onana, 30, has failed to win over the Man United fans thanks to a string of high-profile errors during his two seasons at the club.
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According to Fabrizio Romano, the club have decided to take action and are in talks with Antwerp over a deal for Lammens, 23.
He adds that negotiations are ongoing, but it’s expected the two clubs will come to an agreement over a fee of around €20 million.
Lammens has impressed in his four games for Antwerp so far this season, conceding four goals and saving a penalty in their opening game against Union St.Gilloise.