UEFA has confirmed it will probe the missile-throwing incident which saw Liverpool captain Steven Gerrard struck by an object thrown by a Marseille fan during Wednesday's 1-0 win at Anfield.
Gerrard was clearly struck by an object thrown from visiting French fans while preparing to take a first-half corner in the Champions League Group D encounter.
The England midfielder's 23rd minute header settled a close game in the home side's favour.
The incident has been included in Portuguese referee Olegario Benquerenca's report and also that of the UEFA delegate present at the match.
"We will have to view the reports of the referee and the delegate before we can make a decision," confirmed a UEFA spokesperson.
Meanwhile, Reds boss Rafael Benitez hailed the professionalism of his skipper after he ignored the missile.
"He is a good professional. Steven did well not to react," said the Spanish coach.