The left-back is seemingly unlikely to join Benfica permanently this summer.
Fernandez has been on loan at the Portuguese giants since January, but has only played five times.
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His future is now in doubt, as Benfica are unlikely to exercise their buy option.
Jornal do Noticias now report that Benfica will look at alternatives in the summer.
United rated Fernandez highly when he signed from Real Madrid in 2020, but he has not progressed as expected.