It's gonna be interesting. I initially thought ETH might play 5 at the back but that hasn't been the case so far in friendlies.This is a bad guess because
-They're both left-footed
-They both need to play with a more mobile complimentary half.
-CB was not a very high priority at United yet we've gone out and signed someone in Maguire's positional profile for a considerable amount of money
If we're playing Martinez/Maguire this season something has gone very wrong.
With Martinez, Maguire, Lindelof, Varane, Bailly, Phil Jones and even Telles playing as CB (with Shaw/Malacia occupying LB) there's quite a back log there.
You're right that a mobile CB is much needed, we have that in Bailly on rare occasion he's fit. But also Bailly is the only player that has any sale value at all


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Zarate got Maxi Lopez to chip with some other rich folks buy Birmingham