An inverted full back is a defensive signing pretending to be a creative one

The player who tucks into midfield is mostly there to be standing in the right place when possession is lost.

The inverted full back gets talked about as a build-up idea. Extra body in midfield, better circulation, an overload against a two. All true, and all secondary.

The main job is what happens when the move breaks down.

Think about where an attacking team is most fragile. Not in possession, but in the two or three seconds after losing it, when the opponent's fastest players are already turned and running at a back line that has pushed up and spread out. Traditionally the protection came from a holding midfielder, one man, who could be beaten by a single pass. Bringing a full back inside gives you a second body in that zone, already square to the play, positioned centrally where the counter is going to travel. Rest defence, in the coaching phrase, and it is the entire point.

You can test the claim by watching where the inverted player goes when his side has the ball in the final third. If the idea were really about creation, he would keep advancing. He does not. He holds a position roughly level with the halfway line, slightly infield, doing nothing that would appear in any attacking statistic, and he stays there because the moment he steps forward the structure has a hole in it.

That is also why the role is so often given to a defender who is a good passer rather than to a midfielder who can defend. The passing is a requirement of the position, not the reason for it. Sides that have picked the other way, installing a natural midfielder because they wanted more quality on the ball, tend to look excellent for an hour and then concede twice on the break.

I would push the argument one step further. If the inverted full back is a defensive structure, then the honest way to evaluate it is by counting counter-attacks conceded, not passes completed, and by looking at where the opponent's transitions die. Most public analysis does the opposite and grades the player on progressive passing, which is the part of the job he is doing while nothing dangerous is happening.

There is a cost, of course. Somebody has to hold the width. Usually that is the winger, alone, against a full back, for ninety minutes.

He did not get a vote.