When Patrick Vieira walks out of the tunnel at Old Trafford on Sunday afternoon, it will bring back plenty of memories for the Arsenal legend.
As a player he enjoyed and endured plenty of huge matches against Manchester United, with goals, red cards and plenty of angry exchanges.
Now, he will be wearing a suit rather than his kit, and walking to the away dugout as a manager rather than a fiery midfield general.
Here, Sportsmail takes a look back at his previous flashpoints against Manchester United - and why he'd dearly love to spoil Ralf Rangnick's first game.