Fermanagh rowers Nathan Timoney and Ross Corrigan have secured an Olympic spot for Ireland in the men's pair as Rebecca Shorten's Great Britain women's four boat booked its Paris spot.
Fermanagh duo Timoney and Corrigan were second in their semi-final to reach the final at the World Championships.
Belfast's Shorten then helped GB win their semi-final in Belgrade.
Coleraine's Hannah Scott will also be expected to help Great Britain book Olympic quad qualification later.
As was the case in the men's pair and women's four semi-finals, a top-three finish in the women's quad will secure a World Championship final spot in addition to clinching a Paris berth for the British boat.
Ireland's Olympic champions Paul O'Donovan and Fintan McCarthy also earned their Paris Games spot after reaching the men's lightweight double final in Belgrade with their team-mates Fiona Murtagh and Aifric Keogh doing the same as they finished second in the women's pair semi-finals.