Why Wayne Rooney has a point to prove to himself and the world against Bayern.
Wayne Rooney is expected to be fit to face Bayern Munich, where he will return to the scene of where it all began to go wrong for him.
This goes back to 2009/10, when Rooney had stepped into the shoes vacated by Cristiano Ronaldo with aplomb - emerging as United's true star.
Playing as a central striker, the Englishman dominated Premier League defences, smashing four in a game past Hull and a hat-trick against Portsmouth in the lead up to the encounter.
Rooney opened the scoring for United at the Allianz Arena, his 34th strike in 40 games that campaign.
But as the game spiralled out of the Red Devils' control in the final few minutes and then conceded two late goals - Rooney would pick up a foot injury which ruined his season.
It kept him out of the next Premier League game, which United lost to Chelsea at Old Trafford, ultimately costing them the title.
He made it back for the return against Bayern, but was clearly not 100 per cent and unable to play more than 55 minutes. United crashed out.
Rooney did not score another goal that season, and went onto endure a nightmare World Cup.
Dogged by criticism, his personal life spiralled out on control too amid cheating allegations, and months into the new season he fell out with Sir Alex Ferguson over demanding a move.
He would eventually sign, but the bridge had been burned, leading to the unsettled personal circumstances which surrounded him when the manager retired last summer, and plagued David Moyes' early weeks as boss.
While a regular scorer and important component in United's side - Rooney has never reached the same prolific level as he did ahead of the Bayern tie.
Frequently played in a deeper role, particularly since Robin van Persie's arrival, if ruled fit the striker has a chance to lead the line against the Germans and turn his fortunes full circle.
The match in Germany in 2010 marked the abrupt end of a freescoring Wayne Rooney, even if nobody at the time realised that his unstoppable train was hitting the buffers.
Wayne Rooney is unlikely to have forgotten his last visit to the stadium with United, and while aware of the gargantuan task the Red Devils face if they are to stop Bayern's own dominance, the challenge of exercising his own personal demons will only give him more motivation to lead his side to a memorable victory.