Despite entering their first-ever European adventure, Oliver Glasner's side are adapting very quickly. Without key figures like forward Jean-Philippe Mateta and defender Daniel Muñoz, the Eagles left Dublin with a comfortable win that all but guarantees them a spot in the Conference League qualifying rounds.
A further three points in their upcoming match against Finland's KuPS should be enough to secure straight passage to the knockout stages, especially following a previous setback against Strasbourg.
This occasion provided a chance for several Palace's fringe players to impress. Christantus Uche, making only his second start since joining on loan from Getafe, notched the account with a well-taken goal. Forward Eddie Nketiah contributed a another, scoring for the second game in succession.
A Shelbourne team that had finished their league season were no match against a largely rotated Palace lineup. The visitors were already depleted by the reports that Mateta and Muñoz are sidelined with knee problems.
Despite heavy rain in Dublin, Palace quickly took control. A slick move in the 11th minute, initiated by Daichi Kamada's incisive pass, allowed Nketiah to set up Uche for a simple finish.
Youngster Adam Wharton went close minutes later, driving a powerful effort over the bar. Nketiah then appealed for a penalty after racing into the area, but the referee dismissed the appeals.
Ex-Arsenal striker did not have wait long to get his goal, prodding home from a yard out after Uche's shot had struck the post.
Shelbourne were hanging on for dear life. Defender Kameron Ledwidge was lucky to escape a booking for two agricultural tackles on Yeremy Pino, before Chris Richards struck the woodwork with a powerful header from a corner.
The match was as good as over eight minutes from half-time. Yeremy Pino meandered past a series of weak challenges before coolly dispatching a shot past goalkeeper Wessel Speel to make it 3-0.
After the break, coach Oliver Glasner seized the opportunity to rest key players like Kamada and Wharton. Replacement Romain Esse came close to scoring his very first touch, only to see his effort blocked.
Esse was desperately unlucky later on, seeing one shot crash off each posts before being clasped on the line. Uche then blazed a sitter of a chance, indicating there is still scope for development in his game.
A solitary concern for Palace was a second-half injury to Justin Devenny, who limped off. This paved the way for 17-year-old forward Benji Casey to earn his senior debut, rounding off an otherwise perfect night for the visiting side.
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