Robin van Persie was left red-faced on his return to the Emirates Stadium after attempting to walk into the HOME dressing room.
The Dutchman, who spent eight years with Arsenal before his controversial £24million switch to Old Traffford last summer, made the mistake ahead of today’s Barclays Premier League clash in which he started.
After making his way off the Manchester United team bus, Van Persie walked towards the Arsenal dressing room before realising his error, slapping his forehead and making his way to the away dressing room, sporting an embarrassed smile.
Good to see you: Robin Van Persie shakes hands with Arsenal mascot Gunnersaurus
Wrong door: Van Persie attempts to walk in the Arsenal dressing room
Red faced: Van Persie realises his mistake
Return: Manchester United striker Robin van Persie, seen here waiting with his team-mates for a train to London, will play at Arsenal today for the first time since his £24m move last summer
The former Arsenal captain silenced the Arsenal faithful after he won and converted a penalty for his side shortly before the interval.
The 29-year old also scored in Manchester United’s 2-1 win against Arsenal in November and was on the receiving end of disparaging songs from the travelling support.
But Van Persie returned to his former club as a Premier League champion - after his hat-trick inspired United to a 3-0 win against Aston Villa on Monday and with it their 20th top-flight title - and along with his team-mates received a guard of honour before today's fixture.
Premier League - Top Five
Then and now: Van Persie celebrating a goal in the colours of Arsenal (above) and scoring one of a hat-trick of goals in the 3-0 win over Aston Villa that secured United the title on Monday
Scenes we won't be seeing today: Arsenal fans with a message of love for Van Persie in 2009
Just champion: Van Persie celebrates his maiden title success with Alexander Buttner and Ryan Gigga
Many reasons: Arsenal manager Arsene Wenger insists the goals of Robin van Persie are not the only reason for United's title win