The match at Nancy's Marcel Picot stadium was interrupted in the 79th minute when tear gas drifted onto the pitch after police tried to control rampaging Dutch fans in the stands.

Play eventually resumed and Nancy secured a 3-0 win in their Group E tie over the two-time UEFA Cup winners to advance to the round of 32.

"We're waiting for the report Monday from the UEFA delegate present at the match and we will open an enquiry," UEFA spokesman William Gaillard told AFP.

"We should know the decision (of the disciplinary commission) in ten days before the next round of UEFA Cup matches (on December 13)."

Gaillard added: "The seriousness of the punishment will depend on the date of the last sanction taken against the club.

"We thought that this type of incident was a thing of the past. Some clubs no longer have control (over their supporters). It's true that Feyenoord have 'a past' in the Netherlands and Europe."

By the time of the interruption, Nancy had taken a three-goal lead through Sebastien Puygrenier, an Andre Bahia own goal and Monsef Zerka's penalty. Feyenoord were reduced to ten men by Royston Drenthe's dismissal on the hour.

Feyenoord were hit with a closed door ban by UEFA for clashes in Basel, Switzerland last year and an inquiry is currently underway after a Blackburn player was sprayed with beer in a recent UEFA Cup tie.