Uefa have opened a disciplinary case against Barcelona star Sergio Busquets over alleged racist abuse in the Champions League semi-final first leg against Real Madrid.
The capital club published a video on their website ahead of the second leg, with a subtitle alleging Busquets had made a racist remark towards defender Marcelo during Barca's 2-0 win at the Bernabeu.
Following Barca's 2-0 victory in the first European meeting between the two sides last month, Real reported the Catalan outfit for unsporting behaviour.
During a game which saw Pepe dismissed and coach Jose Mourinho sent to the stands, Real alleged that Barca indulged in play-acting throughout and that Busquets had aimed a racist insult at Brazilian full-back Marcelo.
Barca had earlier reported Real to Uefa over comments made by Mourinho suggesting they were the beneficiaries of continental favours.
Busquets' case will be dealt with on Sunday, with the European governing body's decision communicated to the clubs on Monday.