Despite entering their maiden continental adventure, Oliver Glasner's side are learning at a rapid pace. Missing star figures like striker Jean-Philippe Mateta and defender Daniel Muñoz, the Eagles departed Dublin with a commanding result that all but secures them a place in the Europa Conference League qualifying rounds.
Another three points in their next match against Finland's KuPS ought to be enough to seal straight entry to the knockout stages, particularly following a previous stumble against Strasbourg.
This occasion provided a platform for some of Palace's lesser-used players to impress. Christantus Uche, in only his second beginning after joining on loan from Getafe, opened the scoring with a well-taken goal. Striker Eddie Nketiah added a another, scoring for the second consecutive succession.
The Shelbourne team that had concluded their league season were outmatched even for a mostly rotated Palace lineup. The Londoners were further weakened by the reports that Mateta and Muñoz are out with knee problems.
Despite torrential rain in Dublin, Palace rapidly took control. A flowing passing sequence in the 11th minute, sparked by Daichi Kamada's incisive pass, allowed Nketiah to lay on Uche for a straightforward finish.
Youngster Adam Wharton came close soon after, fizzing a long-range effort over the bar. Nketiah subsequently appealed for a penalty after bursting into the box, but the official waved away the appeals.
The formerArsenal man didn't need to wait long to find his goal, tapping home from a yard out after Uche's shot had struck the post.
The home side were clinging on for dear life. Full-back Kameron Ledwidge was lucky to avoid a booking for a couple of robust tackles on Yeremy Pino, before Chris Richards rattled the woodwork with a powerful header from a corner.
The match was as good as over eight minutes before half-time. Yeremy Pino meandered past some comically weak challenges before coolly slotting a shot past keeper Wessel Speel to make it 3-0.
After the break, manager Oliver Glasner seized the opportunity to rest several individuals like Kamada and Wharton. Substitute Romain Esse came close to scoring with his first touch, but saw his effort blocked.
The youngster was desperately unlucky later on, seeing one attempt strike off both posts before being gathered on the line. Uche also blazed a sitter of a chance, showing there is still scope for development in his game.
A solitary concern for Palace was a late knock to Justin Devenny, who limped off. This paved the way for 17-year-old striker Benji Casey to make his first-team debut, rounding off an otherwise positive night for the traveling side.
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