Uefa has opened a disciplinary case against Atletico Madrid over claims of "improper conduct" by the team and "racist behaviour" of supporters in a youth game against Manchester City.
Devante Cole, son of former Manchester United and England striker Andrew, scored as City's under-19s won 1-0 in Madrid on 26 February.
The victory sent City into the quarter-finals of the Uefa Youth League.
Uefa's disciplinary panel will judge the case on 20 March.
City's match report described a "vocal home crowd eager to play their part in intimidating Patrick Vieira's men".
Both Uefa and Manchester City declined to comment on the incident.