Even though entering their maiden continental adventure, Oliver Glasner's side are adapting very quickly. Missing key players like striker Jean-Philippe Mateta and defender Daniel Muñoz, the Eagles left Dublin with a commanding win that all but guarantees them a spot in the Europa Conference League qualifying rounds.
A further three points in their next match against Finnish KuPS ought to be sufficient to seal direct entry to the last 16, particularly following a previous setback against Strasbourg.
This match provided a chance for several Palace's lesser-used players to impress. Christantus Uche, in only his second start since joining on loan from Getafe, opened the account with a well-taken finish. Forward Eddie Nketiah contributed a another, finding the net for the second consecutive match.
The Shelbourne team that had concluded their domestic season were outmatched against a largely rotated Palace lineup. The Londoners were already weakened by the reports that Mateta and Muñoz are out with knee problems.
Despite torrential rain in Dublin, Palace quickly took control. A flowing move in the 11th minute, sparked by Daichi Kamada's incisive pass, allowed Nketiah to set up Uche for a straightforward finish.
Youngster Adam Wharton went close soon after, driving a long-range effort over the bar. Nketiah then claimed for a penalty after bursting into the box, but the referee waved away the appeals.
The formerArsenal man did not have wait long to get his goal, tapping home from a yard out after Uche's shot had struck the post.
Shelbourne were clinging on for dear life. Full-back Kameron Ledwidge was lucky to avoid a booking for a couple of agricultural challenges on Yeremy Pino, before Chris Richards rattled the woodwork with a header from a corner.
The contest was effectively over eight minutes before half-time. Yeremy Pino weaved past some weak challenges before calmly slotting a shot past keeper Wessel Speel to extend the lead to 3-0.
After the break, coach Oliver Glasner seized the opportunity to rest key individuals like Kamada and Wharton. Replacement Romain Esse came close to scoring with his first touch, only to see his effort blocked.
The youngster was desperately unlucky later on, seeing one shot strike off each posts before being clasped on the line. Uche also missed a sitter of a chance, showing there is still room for development in his game.
The only concern for Palace was a second-half injury to Justin Devenny, who was forced off. This paved the way for 17-year-old forward Benji Casey to earn his senior debut, rounding off an otherwise perfect evening for the traveling side.
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