Manchester United and Roma are considering whether to appeal the fines handed down by UEFA for last month's crowd trouble in Italy.
United were fined £14,500 and Roma £31,000 for the problems during their Champions League quarter-final, first leg at the Stadio Olimpico.
Fans of both clubs threw missiles at each other and also clashed with Italian police, who were heavily criticised for their behaviour by United supporters following the incident in Rome's Stadio Olimpico.
Both clubs have three days in which to appeal after receipt of the written grounds for the decision.
Meanwhile, United confirmed on Wednesday supporters are facing ticket price rises of up to 14% next season.
The Old Trafford outfit have released details of prices for the 2007-08 campaign, which could yet see them defending the treble.
While a range of measures have been introduced to effectively cut the cost of concessionary tickets, meaning an adult with two children will pay less next season than they did this, full price tickets have risen sharply.
The biggest increases are in the lower tiers of the North and South Stands, which will rise from £665 to £722, while the most expensive seats in the stadium are the upper tier of both stands, which rise over 12% to £836.
In addition, all season ticket holders not currently a member of the club's automatic cup scheme, which forces fans to buy tickets for cup games whether they intend to watch the game or not, will be required to join.
Junior tickets in the Family Stand will be frozen at £190, while all junior tickets in other sections of the stadium will be £10, a 48.7% reduction.
Over 65s will pay £20 or half the cost of an adult ticket in the appropriate section of the stadium, whichever is the lower.
Chairman of the Independent Manchester United Supporters' Association (IMUSA), Mark Longden, blasted the price hike, insisting there is 'absolutely no justification' for it.
He said: 'Clearly, it flies in the face of the thinking all over the country, from Bolton to the Emirates (Arsenal's stadium).
'They have all frozen prices and in some cases reduced them.'
A spokesman for the Glazer family said: 'Prices for Old Trafford, when compared to other leading clubs' grounds, still represent very good value for money, supported by the exceptionally high quality of the football on offer.'