Uefa has opened disciplinary proceedings against Chelsea winger Pedro Neto after he pushed over a ball boy during the Champions League defeat by Paris Stu2011Germain.
The 26-year-old Portugal international shoved the youngster in stoppage time of Wednesday's last-16 first leg at Parc des Princes - where Chelsea lost 5-2 - which caused him to fall off a chair.
It sparked an altercation between both sets of players.
Uefa said proceedings have been instigated against Neto for "unsporting behaviour" in accordance with its disciplinary regulations.
"Uefa's disciplinary bodies will take a decision on this case in due course," European football's governing body added in its statement.