UEFA have fined LOSC Lille and, to a lesser degree, Manchester United following the events at their Champions League match in France on 20 February.
The fixture ended in controversy when the French side appeared to threaten a walk-off following Ryan Giggs' late winner for the Reds.
Earlier in the game, there had been serious concern for the safety of United supporters at the crowded away end of the Stade Felix Bolleart in Lens.
An article on UEFA's official website on Thursday evening stated:
"LOSC Lille Métropole have been fined 61,734 (CHF 100,000) by UEFA for offences committed at the UEFA Champions League first knockout round first leg against Manchester United FC in Lens on 20 February.
"The French club were fined for breaches of security provisions and lack of proper organisation, as well as for the improper conduct of the team after United's goal in the English side's 1-0 victory.
"Manchester United have been fined 9,256 (CHF 15,000) for the improper conduct of their fans at the game, which included the setting-off of fireworks and disturbances at the entrance to the stadium.
"Appeals may be lodged against the verdicts within three days of receipt of the written grounds for the decisions."
A spokesman for United responded: "We have no comment to make at this stage, as we have not yet received written explanation of the reasons for the fine."
Note - The setting-off of fireworks, or flares, at a Champions League match leads to a mandatory fine by UEFA.