The British Olympic Association is still trying to convince some athletes to get vaccinated against Covid-19 before next month's Tokyo Olympics, chief executive Andy Anson said.
The BOA said earlier this month it was on track to ensure all athletes and staff were fully vaccinated before the Olympics.
The Tokyo Games, delayed last year because of the Covid-19 pandemic, will begin on July 23.
"We're trying to convince them it's the right thing to do," Anson told the BBC on Friday. "People have got the right to choose, and we have to respect that. But it's not necessarily that helpful."
Japan has largely avoided the kind of explosive Covid-19 outbreaks that have devastated other countries, but its vaccine roll-out was initially slow and the medical system has been pushed to the brink in some places.
Many Japanese people remain sceptical about the possibility of holding even a scaled-down Games safely during the pandemic. Organisers have excluded foreign spectators and limited the number of domestic ones for the event.
Anson said the Athletes' Village in Tokyo will be "probably the toughest environment in sports at this time".
"We are putting in place very strict protocols along with the organisers to make sure, to the fullest extent possible, we follow the rules of isolation, distancing, and just keeping in our own 'semi bubbles,'" he said.
On Wednesday, a second member of Uganda's Olympic delegation, an athlete, tested positive for Covid-19 after arriving in Japan.
It comes after a first member of Uganda's Olympic team tested positive and was denied entry into Japan, in the first detected infection among arriving athletes for the Games that begin in five weeks.
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Inside the Olympic Games Village in Tokyo
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Residential buildings for athletes stand during a media tour at the Olympic and Paralympic Village for the Tokyo 2020 Games, constructed in the Harumi waterfront district of Tokyo. -
Recyclable cardboard beds and mattresses for athletes. -
The main dining hall. -
Partitions are installed at the fitness centre at the multi-function complex. -
A recreation centre is pictured at the multi-function complex of the Tokyo 2020 Olympic and Paralympic Village. -
Residential buildings are seen behind road signs at the Tokyo 2020 Olympic and Paralympic Village in Tokyo. -
Flag poles at the Tokyo 2020 Olympic and Paralympic Village. -
A bathroom inside a residential unit for athletes. -
A view from residential buildings for athletes. -
A fountain is pictured at the Tokyo 2020 Olympic and Paralympic Village. -
A recyclable cardboard bed and mattress for athletes. -
A hand sanitizer and a sign for Covid-19 countermeasures are placed at the main dining hall. -
A machine to check body temperature and hand sanitizers are placed at the doping control station. -
A processing room of the doping control station. -
A man enters the multi-function complex of the Tokyo 2020 Olympic and Paralympic Village. -
Hand sanitizers and signs for Covid-19 countermeasures are placed at the entrance of the fitness centre. -
The main dining hall at the Tokyo 2020 Olympic and Paralympic Village in Tokyo. -
Electric vehicles are pictured at an internal shuttle bus station. -
A room of the fever clinic isolation area. -
The fever clinic (front) at the Tokyo 2020 Olympic and Paralympic Village in Tokyo.
