The UK winner of a £57.9 million EuroMillions jackpot has yet to come forward to claim the prize.
Players are being urged to check their tickets by leading operator Camelot.
The winning ticket for the July 10 draw was bought in the UK and is worth £57,975,367.70 – with the numbers being: 3, 8, 26, 33, 45 - and Lucky Star numbers 7 and 10.
Camelot has said it would reveal more about the area where the ticket was bought if no claim has been staked by around July 24 – next Tuesday.
Andy Carter, senior winners' adviser at The National Lottery, said: ‘We're urging all EuroMillions players to check their tickets as soon as possible but, in our experience, prize winners do not always come forward immediately after the draw.
‘We often find that players have routines and check their tickets once a fortnight, once a month or wait even longer to check a batch of tickets.
‘Maybe the missing ticket-holder has been caught up in the World Cup frenzy.
‘On the same evening as the EuroMillions draw, Belgium and France played their semi-final which was, of course, the night before England played Croatia at the same stage of the competition.
‘Or the ticket-holder might not be a football fan but could have gone away on their summer holidays, not realising they have won.
‘Whatever the reason, we're urging all EuroMillions players to make it their goal to check their tickets as someone will score a cool £57.9 million.’
The winner will be richer than many of the stars of the World Cup who play for clubs in the UK.
According to the Sunday Times Rich List 2018, the EuroMillions winner would be richer than World Cup-winning French midfielder, Paul Pogba, who is worth an estimated £25 million, and Belgium's Kevin De Bruyne, worth £16 million, put together.