Male and female Crystal Palace fans were assaulted outside Wembley Stadium train station by hooligans before their side's FA Cup final loss to Manchester United last month.
Met Police detectives are appealing for information and witnesses to come forward after two football fans were attacked by a group at about at 4.40pm on 21 May.
One male Eagles fan in his 40s was punched in the face by a group outside the north London station before a woman, also in her 40s, was then pounced upon by the group, causing her to fall to the floor before she had her foot repeatedly kicked. Police believe they were targeted because they were Palace fans.
The woman was taken to a North London hospital and received treatment for a dislocated foot, but the man did not require hospital treatment. No arrests have been made and enquiries are ongoing.
The main suspect in the group of men who approached the couple is described as young white male, short and stocky with distinctive side-burns down to his jaw.
DC Lauren Taylor-Rose, from Brent CID, said: "This was nasty unprovoked attack on a couple enjoying cup final day in Wembley. The woman has lasting damage as a result of the foot injury from what was meant to be a fun day out. If you saw what happened or have information please contact us."
A late Jesse Lingard goal secured a 2-1 win for United.