Most people in the UK will ignore the new quarantine rules when arriving in the country, the CEO of Ryanair has claimed.
Michael O'Leary said he thinks authorities will be powerless to enforce the policy that was introduced to reduce the spread of Covid-19.
Mr O'Leady added he believes the rules will be "quietly dropped" or "formally withdrawn" by the end of June as they will not work.
He told the Mail on Sunday : "You can fill up your arrival card as Mickey Mouse, 1 Walt Disney Street, London SW22 – they’ll take the cards and off you go. So it’s a complete shambles.
"The Home Office, Border Force and police will all tell you quietly, and off the record, it [quarantine] is completely unimplementable."
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Home Secretary Priti Patel introduced the new measures, which will be effective from June 8, requiring anyone entering the UK to self-isolate for two weeks.
The rule has no end date but is set to be reviewed every three weeks, the government confirmed.
Airline bosses have warned the quarantine rules will negatively impact their businesses - with O'Leary branding it "useless", "idiotic" and "unimplementable".
Under the rules, people will be ordered to give the address they are quarantining at, and if they do not, they could be forced into a government-run quarantine facility.
Critics have blasted the government for only introducing quarantine months after the outbreak was imported to the UK.
No 10 sources have insisted last night they were firmly behind the plan and that avoiding a second Covid-19 wave is crucial.
They said: "As we get Covid-19 under control here, we can’t start importing more cases."
Mr O’Leary claimed the quarantine policy was pushed through only because the Prime Minister had announced it live on television.
He said: "Most of the politicians and civil servants have already told us the only reason it got introduced was because Boris blurted it out two weeks ago at one of the Downing Street press briefings and they didn’t want to be seen to have a U-turn."
The Ryanair boss said the company will make face masks mandatory for passengers and staff, but asked governments to drop their quarantine measures.
He said: "We strongly urge Europe’s Governments, especially those in Ireland and the UK, to mandate to the wearing of face masks for airline, train and (London) underground passengers, as this is the best and most effective way to limit the spread of Covid-19 in public transport environments where social distancing is not possible.
"We welcome the European Union’s recommendation on face masks, and call again on the Irish and UK Government to abandon their unexplainable, ineffective, and unimplementable quarantine restrictions.
"Europe’s citizens can travel safely on their summer holidays wearing face masks and observing temperature protocols, but 14 day quarantines have no scientific basis, are unimplementable and unnecessary in circumstances where airline, train and underground passengers wear face masks where social distancing isn’t possible."
Ryanair plans to operate about 1,000 flights a day from July 1 to travel hotspots such as Spain, Portugal, Italy and Greece, which all intend to welcome holidaymakers.
