National Lottery officials are searching for two online ticket holders who each won £1.9million in Saturday's draw but have yet to claim their prizes.
The winners matched all six main numbers in the March 1 Lotto draw, sharing a combined jackpot of £3.8million.
Winners have 180 days from the date of the draw to come forward and claim their life-changing winnings.
The winning numbers in Saturday's draw were 06, 11, 14, 19, 41, 43, with 53 as the bonus number.
The lucky winners have 180 days to scoop up millions (Stock)
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The draw used the set of balls number four and the Guinevere draw machine.
No one claimed the top prize for the Lotto HotPicks, which uses the same numbers as the Lotto draw.
The Thunderball draw on the same day had winning numbers 02, 03, 17, 21, 28, with a Thunderball number of 01.
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No players matched five numbers plus the Thunderball to win the £500,000 top prize in that draw.
Andy Carter, senior winners' adviser at Allwyn, operator of the National Lottery, said: "What a way to start the month of March and welcome spring in for two very lucky ticketholders."
"The two would-be millionaires are urged to check their online National Lottery account – they have the opportunity to have that incredible moment of realisation that they have just become millionaires!"
National Lottery officials are searching for two online ticket holders who each won £1.9million in Saturday's draw but have yet to claim their prizes (Stock)
PA
He noted these wins have followed "a fabulous February of millionaire-making on Lotto".
"In total, 13 ticket-holders became Lotto millionaires, including one very lucky winner who scooped the £7.4million jackpot in the draw on February 15," Carter added.
Once the winners check their accounts and discover their good fortune, they should call the National Lottery helpline to claim their prizes.
After claiming, the winners can decide whether or not to go public with their news.
