The jackpot has now reached its maximum 190 million euros, where it will remain for a further four draws until it must be won on the fifth.
The previous highest prize in the Euromillions of just under 190 million euros was by a Portuguese player back in 2014
If a single ticket scoops the top prize, it would create Portugal and Europe’s biggest ever winner.
Portugal has so far seen 66 players become multi-millionaires, the fourth highest number among participating nations.
A 190 million euro jackpot would put the winner in joint 672nd on this year’s Sunday Times rich list, ahead of singers Robbie Williams, who is worth €170 million, and Sir Tom Jones, who is worth €180 million.