Manchester City manager Pep Guardiola has been charged with improper conduct by UEFA and being sent to the stands in the Champions League defeat to Liverpool.
The European governing body has also charged the Reds after fireworks were set off and objects thrown inside the Etihad Stadium.
Guardiola was sent to the stands after confronting referee Antonio Mateu Lahoz on the pitch at half-time during the quarter-final second-leg 2-1 defeat.
The Spaniard was unhappy with the official's decision to rule out a legitimate second goal for his side, as Leroy Sane was adjudged to have scored from an offside position, despite the ball coming off opposition midfielder James Milner before he prodded home.
The improper conduct charge against Guardiola is for communicating with the bench during the second half.
Article 69 of UEFA's disciplinary regulations states that any manager or coach who is sent off may not communicate "directly or indirectly with the team's players and/or technical staff during the match".
Liverpool were already facing four UEFA charges over the setting off of fireworks, throwing of objects, acts of damage and crowd disturbances after City's team bus was attacked at Anfield prior to the first-leg on 5 April. That case will also be heard on 31 May.