Roy Keane left Manchester United in 2005 after falling out with the club's iconic ex-manager Sir Alex Ferguson.

Ruben Amorim could turn to crucial figures of Man Utd's past as he sets out to guide the club into the future.

From David Moyes to Erik ten Hag via Louis van Gaal, José Mourinho, Ole Gunnar Solskjaer and a plethora of interims – the latest of whom, Ruud van Nistelrooy, took charge of his final game on Sunday – United have scrambled for solutions only to keep arriving at the same, miserable outcome. Rinse, cycle, repeat – despite all the money thrown around.