Uefa have opened disciplinary proceedings against Anderlecht following the ugly scenes during their Uefa Cup clash against Tottenham.
Didier Zokora appeared to be struck by lighter thrown from the crowd and Spurs goalkeeper Paul Robinson was also targeted.
Robinson picked up a metal rod which he handed to the fourth official after the final whistle of the 1-1 draw at the Constant Vanden Stock Stadium in Brussels.
A Uefa spokesman said: "Uefa have opened disciplinary proceedings against Anderlecht for the throwing of objects by spectators."
The Belgian side have already been fined for crowd disturbances during a UEFA Champions League qualifier earlier in the season against Fenerbahce and Uefa officials will take previous cases into consideration when they meet.
The punishments range from a fine to expulsion from the tournament.
"The control and disciplinary body will meet on 13th December to make a decision on this case," the spokesman added.
Zokora claimed afterwards that he was targeted as he used to play for Anderlecht's rivals Genk at the start of his career, yet he also had cause for celebration as the point earned Spurs a place in the knockout stages of the competition.
Spurs head coach Juande Ramos was hit by Real Betis fans when he was at Sevilla and although he did not see Zokora struck, the Spaniard said: "This is very bad for the players and those who work in football.
"We have to be left in peace on the pitch and you can't have objects thrown because somebody could get hurt."