Reports state that the Cameroon international will earn a higher salary at Trabzonspor, who will also pay bonuses and a signing-on fee.
Amorim has opted to start Turkish ‘keeper Altay Bayindir ahead of Onana in the Premier League despite a series of shaky performances.
Onana’s imminent departure means Amorim will have to decide whether to stick with Bayindir, whose mistake nearly cost United a [first win of the season against newly-promoted Burnley](/sport/football/man-utd-burnley-result-premier-league-b1245206.html) before the international break, or hand Lammens his debut at the Etihad Stadium in Sunday’s Manchester derby.