Playing three at the back has become a lot more fashionable in recent years, but you need certain types of players to make it work.
The biggest problems will come if you allow your wing backs to become overloaded, because it means they can get dragged out of position or the central players have to come wide to help, and that creates a weakness on the other side.
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You also need to have defenders who are willing to step out from the back and provide an attacking threat from a deeper area, and Kristoffer Ajer does bring that for Celtic.
He was impressive against AC Milan last night despite a fairly mediocre team performance, and these highlights show how impressive his all-round game can be:
Kristoffer Ajer certainly put in a fantastic display against AC Milan. The Milan directors must have liked what they saw last night. Kept putting Zlatan in his back pocket.
— 🇳🇴 Football (@NORftbl) October 23, 2020
Pictures from UEFA Europa League
The last couple of games have shown that this Celtic squad are really struggling to play well from this formation so we probably won’t see it again for a while, but it does suit Ajer perfectly.