Onana is now joining Trabzonspor on-loan for the season.
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The Sun says Amorim was left furious after his senior goalkeeper returned to preseason demanding an improved deal.
With United missing European qualification last season, it meant a raft of senior players - including Onana - saw their salary cut by 25 per cent for the new season.
As such, Onana was seeking a new deal to cover for the loss, a gesture that left Amorim furious after last season's performance.