Even though embarking on their first-ever European campaign, Crystal Palace are learning at a rapid pace. Without key players like forward Jean-Philippe Mateta and defender Daniel Muñoz, the London club departed Dublin with a comfortable win that virtually secures them a spot in the Conference League playoffs.
Another three points in their upcoming match against Finnish KuPS should be sufficient to seal straight entry to the last 16, especially after a prior stumble against Strasbourg.
This occasion offered a platform for several Palace's fringe players to impress. Christantus Uche, in only his second start since arriving on loan from Getafe, opened the scoring with a well-taken goal. Striker Eddie Nketiah contributed a second, finding the net for the second game in match.
The Shelbourne side that had finished their domestic season were no match even for a mostly second-string Palace lineup. The visitors were already weakened by the news that Mateta and Muñoz are out with leg problems.
Despite heavy rain in Dublin, Palace quickly established dominance. A flowing passing sequence in the 11th minute, initiated by Daichi Kamada's clever pass, allowed Nketiah to lay on Uche for a simple tap-in.
Youngster Adam Wharton went close minutes later, driving a powerful shot over the bar. Nketiah then claimed for a penalty after bursting into the area, but the official dismissed the protests.
The formerArsenal man did not have wait long to find his goal, tapping home from close range after Uche's effort had struck the post.
Shelbourne were clinging on for dear life. Defender Kameron Ledwidge was fortunate to escape a booking for two agricultural tackles on Yeremy Pino, before Chris Richards struck the crossbar with a powerful header from a corner.
The contest was effectively over eight minutes from half-time. Yeremy Pino weaved past a series of weak challenges before coolly slotting a shot past keeper Wessel Speel to extend the lead to 3-0.
Following the break, manager Oliver Glasner seized the opportunity to rest key players like Kamada and Wharton. Replacement Romain Esse almost scoring his first touch, but saw his effort blocked.
Esse was incredibly unlucky later on, seeing one attempt strike off both posts before being clasped on the line. Uche then missed a sitter of a chance, indicating there is still room for improvement in his game.
The only worry 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 make his first-team debut, capping an otherwise perfect night for the visiting side.