Two Liverpool fans have been injured after 50 supporters fought for a single Champions League final ticket in Athens.
Liverpool fans enjoy Athens
Police in Greece said around 100 drunken fans became embroiled in the row.
The two men were treated in hospital.
The fight highlights what has become a source of anger among the thousands of Liverpool fans in the Greek capital.
Just 17,000 tickets have been allocated to Liverpool supporters, with AC Milan getting the same number.
British police say there will be 25,000 Reds in Athens tonight - but the club says the figure is more likely to be 40,000.
With the value of tickets on the blackmarket soaring, and many fakes in circulation, fans have been warned not to buy from touts.
Some tickets are reported to be changing hands for 5,000 euros (£3,400).
One supporter, John Milce, said: "I'm prepared to pay 400 euros for a ticket, and am cautiously optimistic of getting one for that amount or less before kick-off."
Many fans will be waking up with sore heads this morning.
Several hundred Reds were still drinking, dancing and singing on steps in Syntagma Square, in the city centre, at 1.30am local time.
Elsewhere in the city, supporters roared their anthems into the night air as they dined outside restaurants or drank outside bars in the final hours before the club bids to land a sixth European crown.
A police spokesman said there were no arrests or incidents to report.
An estimated 12,000 fans were in Athens by last night and have been given leaflets detailing what they should do if they have a problem during their time in Greece.
Thousands more are due to pour in later today with 8,000 departing from Liverpool John Lennon Airport alone.
Supporter Clive Cook, who bought a ticket for 400 euros, said: "I don't think they should have these events in grounds with a capacity under 80,000, especially when they give us only 17,000 tickets."
Chief Superintendent Dave Lewis, who is in Athens to assist Greek police, accepted that fans had travelled without tickets, contrary to his pleas for them not to do so, but asked that they stay away from the ground to avoid problems for their own "kith and kin".
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