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He's been at his best when he's been allowed to roam as the play making #8, from his Monaco days imo. Dropping deep to progress play, linking defense to attack, and being the midfield conduit where the game flows through him akin to a classic midfield metronome.
But what I've started to notice recently is that his tactical understanding of the game off the ball has started to improve. In the game yesterday he was playing deeper in midfield but was at times telling his older team mates to watch the threat in the defensive wide space, while he stayed tight on the oppo player breaking through into the half space. His work rate and pressing was a particular pleasing aspect in the game and he has the potential to provide tactical flexibility for any head coach due to his ability to play in multiple positions and different formations.