Three Aberdeen fans required hospital treatment following clashes before and after Thursday's Uefa Cup match against Atletico Madrid.
Aberdeen and Atletico fans clashed before the game in Madrid
The British Embassy is liaising with local authorities to find out what happened in the Spanish capital.
Reports in Spain suggest up to 17 people were injured as fans threw bottles before riot police intervened.
About 6,000 Aberdeen fans travelled to the game, which the Dons lost 2-0, with only 3,000 tickets for the Scots club.
Police intervened to separate the rival supporters who pelted each other with bottles and other objects in the Vicente Calderon Stadium.
Most of those injured suffered minor cuts and bruises.