Olympic champion Adam Peaty expects "extreme" measures to be put in place to ensure Tokyo 2020 goes ahead next year and lives are not put "at risk" due to COVID-19.
Peaty, who won gold in the 100 metres backstroke at Rio 2016, is currently completing in a bio-secure bubble at the International Swimming League in Budapest in Hungary.
Based in a hotel for large periods during the six weeks of racing, Peaty admitted the strict safety procedures did not come "without its difficulties".
But Sky Sports reported the 25-year-old British swimmer believes there will be similar COVID-19 countermeasures in the Japanese capital next summer and is even preparing for a "full lockdown" when he bids to defends his Olympic title.
"I can't see it going ahead without extreme procedures being in place like this," Peaty said.
"There's too many lives at risk, especially in Tokyo where the population density is so high and with an ageing population as well - it's too much of a big risk.
"I'm already preparing to be in full lockdown in a bubble and then get to my performance that way.
"If we prepare for the worst then if anything else better comes along, we're already winning."
Peaty is delighted to be back racing after the coronavirus pandemic halted the swimming season as he looks to spearhead London Roar to glory in the ISL.
"I'm very grateful we can race but it doesn't come without its difficulties when you're in a bubble," Peaty said.
"You're in your hotel room quite a lot but it's what it takes and I've got five matches left to get going.
"The first match was good, I was really impressed by it and it's exactly what the sport needs.
"All you do is swim, train, swim, sleep, swim.
"Everything's about swimming."
Although frustrated by the lack of competitions due to COVID-19, Peaty believes the extra time to fine tune his game will benefit his performances.
"It does mess with your mind a little bit but I saw it as an opportunity to improve," Peaty said.
"I did a lot of cycling and weights in my gym and put a lot of weight on which is helping now because I've lost that but kept the strength."
Peaty is setting his sights on breaking his own 100m world record of 56.88 but has ruled out competing in the 200m breaststroke at Tokyo 2020.
"Some of the Russian and Australian boys who are world leaders are up to 20 kilogrammes lighter," added Peaty.
"That's 60 strokes where I'm carrying an extra 15kg.
"That will help in the 100m and allows me to have more strength and power.
"Simply if you want to push the boundaries of where the human body can go in the 100m, you stay at this weight."