The inverted fullback is a rest defence fix first

Tucking a fullback into midfield is not about creativity; it is about who is standing where when the ball is lost.

People describe the inverted fullback as a way of adding a passer to midfield, which is true and secondary. The first reason to do it is that when your team loses the ball high up the pitch, you want three players near the halfway line arranged in a triangle rather than two centre backs strung across a huge gap with nobody in front of them.

That is the whole thing. A fullback who has stepped inside is already positioned to intercept the first counterattacking pass, which is nearly always played into the space between the centre backs and the midfield line. A fullback who is out wide and forty metres up is a spectator to that pass and will spend eleven seconds sprinting diagonally to be too late.

But the move only works with a specific midfield profile alongside it, and this is where I think a lot of sides copy the shape and inherit the problems without the benefits. If your holding midfielder is a positional player who screens and passes, an inverted fullback beside him is a duplicate, and you have built a slow, tidy pivot that cannot cover width. What you need next to the tucked-in fullback is someone with range, a midfielder happy to be dragged twenty metres either side, because the fullback is not going to do that job and somebody has to.

The other requirement is a winger who genuinely holds the touchline. If nobody occupies that space, the whole pitch narrows, the opposition fullback tucks in as well, and now your extra midfielder is in a crowd rather than free. I have watched teams invert a fullback and simultaneously ask their wide player to come short, which cancels both instructions at once.

There is a defensive cost people wave away. Your inverted fullback is not defending the wide area, so when the ball does reach the opposition winger in a bad moment, the centre back has to step out. If he is not comfortable defending in space thirty metres from goal, this shape will feed him to somebody every week.

It is a fine idea. It is also a package deal, and the clubs that got hurt by it bought the shape and left the requirements in the box.