Swansea City have complained to UEFA over the treatment of their supporters during their Europa League game against Napoli earlier this week.
According to the club's website, many travelling fans missed the first 20 minutes of the match after being delayed by Naples Police.
A statement on the team's website said: "For our fans to be treated in this way is deplorable. There is simply no excuse and we will be demanding answers from both UEFA and the Naples authorities.
"To make matters worse, this is not the first time this has happened to visiting fans in Naples. Arsenal fans suffered the same fate there in the Champions League recently. We thought we had done everything possible to alleviate any issues for our fans. We sent a delegation from the club, South Wales Police and the Football Association to Naples last month to discuss previous problems with the local Police.
"We thought we had made positive progress because we were given assurances that previous issues would not be repeated for Swansea City fans. Unfortunately, most of the promises and assurances we were given were not honoured on the night. We did everything possible on the night to rectify the situation by getting the British Consulate, UEFA delegates and Napoli officials involved. Unfortunately we had no control over events."
Last season's League Cup winners were beaten 3-1 by the Serie A side yesterday, knocking them out of the tournament.
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