Physically it seems fairly weak combo, but it takes time perhaps. Not only is Matuidi new to Italy and it's tactical habits, new to 2 man midfield instead of his usual 3 man one, but also he needs to learn when to not drift too much, in this formation you need them to be more holding sitting role, and evaluate when to stray too much to pressure opponents as he likes to do.
He is essentially a mobile box to box player so should take time to get handle of how to move within the scheme.
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