Fans were instructed through the NHS Test and Trace app to self-isolate for seven days.
Passengers reported on a fan forum that up to five flights organized by Manchester City for the game against Chelsea were affected.
It follows reports that Portugal will be removed from the green travel list on Thursday.
The summer hotspot is slated to be put on the amber list after a meeting between Westminster, the decentralized governments and the Joint Biosecurity Center, according to the BBC.
Dom Farrell, a sports writer for Stats Perform, traveled to Porto for work and received a notification from NHS Test and Trace four days after flying home.
He said a colleague on the same flight received the same notification, leading him to believe that others on board had also done the same.
Mr Farrell said it was unnecessary for the game to take place overseas when two English clubs compete against each other.
He said, “If I’m being completely honest, it shouldn’t have happened. And I’m not saying that because I have to isolate myself.
“It just seems silly that it didn’t happen in the UK.”
Wembley was considered as an alternative venue for the game, but the UK government failed to comply with requests to allow quarantine exemptions for thousands of sponsors, VIPs and broadcasters.
City and Chelsea have both played five home games in the Champions League this season to reach that game. I don’t understand why they couldn’t have played the sixth in this country without all the dignitaries there
Farrell said: “City and Chelsea have both played five home games in the Champions League this season to get to this game. I don’t understand why they couldn’t have finished sixth in this country without all the dignitaries there.
“I’m fine – I can account for my tests by spending at work, but there will be people who have been on that flight who have paid for a ticket, have paid for all of their tests and are now going to lose maybe a week of work.”
Andy Saunders of St. Albans was instructed by his NHS Test and Trace app to self-isolate for 10 days after returning on a flight from Chelsea’s “appointed travel partner” – a Tui flight, he said.
He said it was “frustrating” because he had tested negative since returning home and had his first and second Covid vaccinations.
In order to travel to the game, he had to take a PCR test on the Thursday before departure, fill out a passenger search form at both ends and provide proof of the test two days after his return.
He told the PA news agency: “The wearing of masks by Chelsea fans [on the flight] was very indulgent and everyone behaved well. I think that makes it even more frustrating. “
WhatsApp image 06/03/2021 at 3:44:21 pm (1)
He said holding the game in Portugal was an unnecessary risk.
“It is absolutely ridiculous that it took place in Porto,” he said.
“I live 35 minutes from Wembley, making myself get on a plane and fly over and expose myself to these risks that have clearly manifested themselves is ridiculous.”
However, he said he did not blame the clubs, adding, “It was a pure decision of the UK government not to allow quarantine lifts for people who walk in.”
He also said he didn’t regret leaving, calling it a “once in a lifetime opportunity”.
“It’s the absolute highlight for a football fan,” he said.
Uefa, Chelsea FC, Manchester City FC, Tui, Ryanair and Jet2 have all been asked for comments.
Additional coverage by the press association.