Arsenal midfielder Jack Wilshere has been charged with misconduct by the Football Association following his anti-Tottenham chants during the FA Cup victory parade on Sunday.
The 23-year-old, who came through the Gunners' youth ranks, took to the microphone to mock the club's fierce rivals as the players celebrated on a stage outside the Emirates Stadium.
In similar scenes to 12 months ago, Wilshere then proceeded to lead the massed ranks of Arsenal supporters in a chant which included expletives against Spurs, who again finished below their north London neighbours in the Barclays Premier League table.
On Monday, Wilshere apologised if his actions had caused any offence and was spoken to by Arsenal staff on the issues.
However, the FA has now launched formal disciplinary proceedings.
A statement read: "Jack Wilshere has been charged with misconduct in relation to Arsenal's FA Cup celebrations on Sunday 31 May 2015.
"It is alleged his conduct in making and/or inciting certain comments during the club's open bus trophy tour was improper and/or brought the game into disrepute.
"The player has until 6pm on 10 June 2015 to respond to the charge."
Wilshere had been warned by the FA following similar comments during the 2014 celebrations, and it is understood the latest outburst prompted the formal disciplinary action and may well result in a fine.
Arsenal issued a swift apology from the studio presenter during their in-house media broadcast of the event on Sunday.
While falling short of saying sorry for making the remarks, Wilshere used a Twitter post to apologise to anyone who had been upset by them.
''Sharing back2back Cup wins with so many amazing Gooners is a dream come true. Apologies if I upset or offended any of u with my celebrations,'' he wrote.
Wilshere, who is set to join up with England this week for the June internationals, received support from fans, with the chair of the Arsenal Independent Supporters Association claiming the player's outburst showed that he ''totally understands what it is to be an Arsenal supporter''.
However, former Gunners striker Niall Quinn said Wilshere had ''overstepped the mark''.
On the pitch, Arsenal are expected to return from their summer break a stronger unit as manager Arsene Wenger targets a sustained assault on the Barclays Premier League title following back-to-back FA Cup triumphs.
Arsenal are intent on improving the squad over the summer, with Chelsea goalkeeper Petr Cech one transfer target said to be keen to secure a switch across London to the Emirates Stadium.