Crusaders booked their place in Europe thanks to Sunday's emphatic Irish Cup win over Ballymena United.
Stephen Baxter's side made it back-to-back successes in the competition with a 4-0 victory at Windsor Park.
Ross Clarke, Adam Lecky, Philip Lowry and Paul Heatley got the goals to confirm the Shore Road men's place in Europe next season.
Read more: From 'so bad' to 'so good', Lowry explains Crusaders' Irish Cup redemption
It means four teams will contest this season's European play-offs - Glentoran, Cliftonville, Coleraine and Glenavon.
Here are the semi-final fixtures and dates, and when the final will be played:
Play-off semi-finals - Wednesday, May 10
- Glentoran vs Glenavon, The Oval, 7.45pm
- Cliftonville vs Coleraine, Solitude, 7.45pm
Play-off final - Saturday, May 13
- Winner SF1 vs Winner SF2, at home ground of highest ranked club in the regular season, 5.30pm
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