There is no reason to not let him go at this point, he cost us £120,000 per week just by staying on the club and on top of that there are 4 goalkeepers in total for now. Lammens would be the top choice followed by either Bayindir or Tom Heaton so there is really no reason for him not to move out if he wants to be called for International duties
Did you know that before the news of his exit broke out, he was requesting for a renegotiation of contract? Most of Manchester United's players have a special clause in their contract that if the club fails to qualify for the Champions League, they will take a 25% salary cut, which affected Onana, and he had the guts to walk up to the manager to ask for a raise. Can you imagine that? After everything he had put the club through, he's the last person to want a raise. I just can't wait for him to be shipped out of United.