Atletico Madrid boss Diego Simeone is being investigated for his explicit gesture against Juventus, while the Bianconeri could be punished for a late start.
UEFA confirmed on Monday that disciplinary proceedings had been opened against Atleti for blocked stairways at Wanda Metropolitano, throwing of objects and improper conduct, relating to his crotch-grab celebration after his side took the lead last week.
Its statement added Juve were also being probed for a late kick-off during their 2-0 defeat to the Spaniards, as was Coach Max Allegri.
However, Simeone may avoid a touchline ban for the trip to Turin on March 12 as UEFA failed to confirm when its Control, Ethics and Disciplinary Body would deal with the case.
The former Inter and Lazio midfielder caused controversy with his celebration after Atleti had gone a goal up in their Champions League last-16 first leg, turning towards the fans at the Metropolitano and grabbing his crotch.
Although he insisted the gesture ‘came from his heart’, many viewed it as a protest towards VAR, which penalised his side twice.