He's arguably the difference between winning a league title and second place.
He's certainly one of the world's best defenders.
Yet, William Saliba, at just 22, is already looking to make up for lost time.
When he sustained a back injury on March 16 in the Europa League last-16 second leg against Sporting Lisbon, Arsenal were top of the Premier League by five points.
The Gunners' next 11 games without him resulted in three consecutive draws and three losses, amid five victories. Manchester City had wrested the league away from their grasp.