Possession with a purpose

For a long time, possession has been one of football’s easiest shortcuts.

A team finishes with 65% of the ball, and we say they controlled the game. Another finishes with 35%, and we talk about them defending, surviving or playing on the counter.

It makes intuitive sense.

If you have the ball, the opposition cannot score with it. If you keep the ball longer, you are presumably dictating where the match is played and what happens next.

Except football does not always work like that.

Across the opening weeks of this Premier League season, we have already seen teams win matches despite spending less time in possession. We have seen sides willingly concede the ball, protect particular areas and wait for opportunities to attack. We have also seen teams accumulate possession while creating relatively little with it.

That leaves us with a deceptively difficult question.

What does it actually mean to control a football match?

Because perhaps possession and control were never quite the same thing.

Possession tells us who had the ball

Let's begin by understanding what possession actually measures.

At its most basic level, possession indicates how the ball is divided between the two teams, and this is useful information. However, problems arise when we expect possession statistics to reveal more than they can.

Possession percentage does not indicate where the ball is on the field. It doesn’t show whether a team is simply passing the ball between their center-backs or making repeated attempts to enter the opposing penalty area. It also fails to reveal whether passes are breaking through defensive lines, how much offensive threat is being generated, or if the team without the ball is genuinely feeling pressure.

This distinction is important and ties back to the previous article in this series, "Passing With a Purpose." There, we explored concepts like expected threat (xT) and expected possession value (EPV), arguing that not all passes should be valued equally. For example, a five-metre pass between two center-backs is not equivalent to a pass that bypasses three defenders and creates a chance for a forward.

Both may count as a completed pass, but their impact on the game is entirely different. Therefore, if not every pass holds equal value, it logically follows that not every minute of possession is equally valuable either.