Steven Gerrard and Patrick Vieira enjoyed many fierce battles on the pitch, and on Saturday they will renew their rivalry on the touchline when Aston Villa take on Crystal Palace.
The pair were involved in some memorable hard-hitting contests when Liverpool faced Arsenal in the early 2000s.
Both men are now in the early stages of their Premier League managerial careers and if the fixture at Selhurst Park is anything like their epic on-field encounters then a similarly bruising match is expected.
However, It won't be the first time they've faced each other in the opposite dugout.