Manchester United refused to make any signings in January with no permanent manager in place.
United appointed Ralf Rangnick as interim boss after Ole Gunnar Solskjaer's dismissal in November but have yet to appoint a manager on a permanent basis.
Given the uncertainty at Old Trafford, the club decided against making any signings last month despite not being short of options.
United had been in contact with Zakaria's agent since December but ultimately opted against a move for the Switzerland international. He then left Borussia Monchengladbach for Juventus.
Marseille midfielder Kamara was also a possibility towards the end of the window but United once again decided against a move as they did not know if it would be a smart decision given the uncertainty over the managerial vacancy at Old Trafford.
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