Swansea City will be complaining to UEFA after describing the treatment of fans at Napoli as "nothing short of disgraceful".
The Liberty Stadium outfit fell to a battling 3-1 UEFA Europa League last-32 defeat at the Stadio San Paolo, but the club claims as many as 700 of the 900 travelling supporters did not reach the stadium until 20 minutes after kick-off.
As well as delays to buses travelling from the capital Rome, Swansea also say it took more than two hours to transport 200 fans from the local police's designated meeting point in the port area of Naples, just a few miles from the ground.
"For our fans to be treated in this way is deplorable," a Swansea spokesperson told the club's official website. "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.
"As a club, we appreciate the tremendous support our fans have given us over the years. Having travelled so far to support the club at substantial cost, for them to be treated in this manner is nothing short of disgraceful.
"Our supporters were impeccably behaved in Italy and were again a credit to the club. For them to be treated in this manner is totally unacceptable."
Napoli will meet Porto in the last 16 of the Europa League.
|High hopes for Paraguay - Diaz|
|Gareca: More to come from Peru|
|Gerrard had European offers|
|Argentina out to spoil Chile´s party - Martino|
|Sampaoli: Chile won´t change style|
|Di Maria will come good at United - Rojo|
|Peru 2 Paraguay 0: Gareca´s men finish third at Copa|
|United States 4 Guatemala 0: Klinsmann´s men win comfortably|
|´I’d prefer no-one to know my name´ - Bassett|
|Matthews completes Sunderland move|
|Podolski set for Galatasaray medical|
|Gundogan inspires Dortmund victory|
|Inter confirm Montoya capture|
|Murillo joins Inter, as Kuzmanovic and Obi depart|
|Falcao signing not a risk, says former Chelsea star|
|Deeney agrees new Watford deal|
|Confidence and service the key to Falcao success at Chelsea|
|No bids for ´Chelsea target´ Baba, claim Augsburg|
|Derby swoop for Ince|
|Fiorentina consider legal action over Salah ´no-show´|
|Chelsea the team to beat in the Premier League, says Neville|
|Storari exits Juve for Cagliari|
|UEFA removes FFP restrictions on Man City and PSG|
|West Brom hope for new owners within the month|
|Chelsea agree loan deal for Falcao|
|Kuyt eyes trophies on Feyenoord return|
|Chile v Argentina: History beckons ahead of Copa America final|
|Wallace extends Monaco loan|
|Mihajlovic wants to instill fear factor at Milan|
|Mignolet improving at Liverpool - Grobbelaar|
|Mumbai City name Anelka player-manager|
|Olivia the parrot predicts Japan to win Women´s World Cup|
|Lusitans coach blasts Bilic´s ´lack of respect´|
|Sakho eyes more Europa League wins|
|Gareca wants Peru to keep building|
|Chile ´no chance´ if Argentina produce their best - Diaz|
|Ocampos joins Marseille permanently|
|Europa League Review: Cloud-nine Brondby ignite opening round|
|West Ham 3 Lusitans 0: Sakho nets twice at start of Europa League journey|
|Holebas makes Watford move|
|Milan secure Adriano signing|
|Peru v Paraguay: Diaz counts cost of semi-final loss|
|Bastia hit out at reports of extra debt|
|Hernandez has successful surgery|
|Odemwingie signs one-year Stoke extension|
|Uth signs for Hoffenheim|
|Henen seals Everton return|
|Cattermole pens long-term Sunderland deal|
|United States v Guatemala: Klinsmann backs Dempsey ahead of Gold Cup warm-up|
|West Ham working on Jenkinson return - Gold|
|Milan agree deal for Bacca|
|Real buy back Vazquez from Espanyol|
|Richards leaves Swansea for Fulham|
|McShane signs for Reading|
|Giggs tells youngsters to seize US chance|
|Hammond pens Leicester extension|
|Only Schweinsteiger can decide Bayern future - Guardiola|
|Cech plans to play until he´s 40|
|Montoya arrives in Milan ahead of Inter move|
|Hernandez out of Gold Cup|
|US asks Switzerland to extradite seven FIFA officials|
|MLS Preview: Sounders seek momentum switch|
|Mexico 0 Honduras 0: Hernandez injury sours friendly|
|Hernandez taken to hospital|
|Garay in doubt for Copa America final|
|Wambach: USA peaking for World Cup final|
|Bassett ´an absolute hero´ despite own goal - Sampson|
|Japan 2 England 1: Late own goal breaks English hearts|
|Salvo quits as Valencia president|
|Costa not Ribery cover - Bayern director Sammer|