Goals from Maxence Lacroix and Evann Guessand were enough for the Eagles to see off Zrinjski Mostar at a boisterous Selhurst Park.
But who else is still in the tournament following another bumper night of Conference League action across the continent?
Here’s the highlights…
#### **Fiorentina survive dramatic fightback**
One of the pre-season favourites for the trophy, Fiorentina were given an almighty scare before eventually progressing.
Leading 3-0 from the first leg, their tie against Jagiellonia appeared to be over, particularly with the Italians at home in the second leg.
But the Polish side produced a brave comeback thanks to a stunning Bartosz Mazurek hat-trick. His third goal levelled the tie at 3-3 just four minutes into the second-half.
Both sides had chances to win it before the eventual extra time. Nicolò Fagioli's volley for the Viola and a Taras Romanczuk own goal shortly eventually put them back in control.
One final scare came with two minutes to play thanks to Jesús Imaz's long-range strike for the visitors. But ultimately Fiorentina hung on for a 5-4 aggregate win.
It completed a good week for the Tuscan side, who also climbed out of the Serie A relegation zone with a 1-0 win over Pisa on Monday night.
Sigma Olomouc only snuck into the play-off round on goals scored which secured a 24th place finish in the league phase before Christmas.
But their European journey will continue after they stunned Swiss side Lausanne-Sport in a tense clash.
After a 1-1 draw in the first leg, Jáchym Šíp fired home for Czech side to put them in front on aggregate.
Omar Janneh levelled for Lausanne, before Karim Sow and Nathan Butler-Oyedeji went close to giving them the lead.
But they were hit with a sucker punch when Antonín Růsek made space for himself in the box to finish brilliantly after a well-worked corner.
Lausanne threw everything at the Olomouc goal late on, but it was too late, the away side holding on for a memorable victory. It is the furthest they have progressed in a major European competition since they reached the UEFA Cup quarter-finals in 1992.
* KuPS 0–3 Lech Poznań
* Noah 1–4 AZ
* **Zrinjski Mostar 1–3 Crystal Palace**
* Jagiellonia Białystok 4–5 Fiorentina
* Shkëndija 0–5 Samsunspor
* Drita 4–6 Celje
* Sigma Olomouc 3–2 Lausanne-Sport
* Omonia 1–4 Rijeka
The eight play-off winners now progress to the Round of 16, where they will each face one of eight clubs who finished in the top eight of the league phase.
Palace will be drawn against either Mainz 05 or AEK Larnaca.
The draw will take place at 13:00 GMT on Friday.