Aidan Walsh will have to win a four-man box-off if he is to become a two-time Olympian following his defeat in Bangkok in his last-eight encounter with Jordan's Zeyad Eashash.
The Tokyo bronze medallist was fighting for a place in Paris but got undone by two refereeing decisions, which cost him a point in both the second and third round and ultimately a place in this summer's showpiece.
Walsh comfortably won the first round but was deemed to be holding in the subsequent stanzas, which led to a 4:1 split-decision victory for his Jordanian opponent, who progresses to Paris.
The Belfast man must now come through a box-off with the other three defeated last-eight contestants for the one remaining place in the 71kg division.
Gráinne Walsh is one bout away from booking her spot at the 2024 Olympics after a dominant victory over Seda Sanago in their last-16 bout.
The Tullamore welterweight outclassed her Ivory Coast opponent from start to finish, scoring a unanimous 5-0 win among the judges to edge a step closer to Paris.
Victory in Sunday's quarter-final will seal her ticket to Paris.
Earlier, Daina Moorehouse moved a step closer to the Paris Games with victory at the Olympic qualifying tournament in Bangkok.
The Wicklow boxer moved into the last 16 of the tournament with an impressive 4:1 split decision victory over Armenia's Anush Grigoryan at the Indoor Stadium Huamark.
Moorehouse is now two wins away from claiming a place at this summer's showpiece, and is back in the ring on Saturday.
Meanwhile, Dundalk fighter and former world champion, Amy Broadhurst's Olympic dream is over.
Having changed allegiance to Great Britain, Broadhurst was beaten in the 60kg lightweight category by South Korea's Oh Yeon-ji.
Grainne Walsh is also in action later today.
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