Even though embarking on their first-ever continental campaign, Crystal Palace are adapting at a rapid pace. Without star players like striker Jean-Philippe Mateta and wing-back Daniel Muñoz, the London club departed Dublin with a comfortable win that all but guarantees them a spot in the Conference League qualifying rounds.
A further three points in their next fixture against Finland's KuPS ought to be enough to secure straight passage to the last 16, especially following a previous stumble against Strasbourg.
This occasion offered a chance for some of Palace's lesser-used players to shine. Christantus Uche, making only his second start since arriving on loan from Getafe, opened the account with a well-taken finish. Striker Eddie Nketiah added a second, scoring for the second game in succession.
The Shelbourne team that had finished their domestic season were outmatched even for a mostly rotated Palace lineup. The Londoners were already depleted by the reports that Mateta and Muñoz are out with leg injuries.
Despite heavy rain in Dublin, Palace quickly established dominance. A slick passing sequence in the 11th minute, sparked by Daichi Kamada's clever pass, allowed Nketiah to lay on Uche for a straightforward finish.
Midfielder Adam Wharton came close soon after, driving a powerful effort over the bar. Nketiah then appealed for a penalty after racing into the box, but the referee dismissed the protests.
Ex-Arsenal striker didn't need to wait long to get his goal, tapping home from close range after Uche's shot had struck the post.
Shelbourne were clinging on for dear life. Defender Kameron Ledwidge was fortunate to escape a booking for two robust challenges on Yeremy Pino, before Chris Richards struck the woodwork with a powerful header from a corner.
The match was effectively over eight minutes from half-time. Yeremy Pino meandered past some weak challenges before calmly slotting a shot past keeper Wessel Speel to make it 3-0.
Following the break, coach Oliver Glasner took the chance to withdraw several players like Kamada and Wharton. Replacement Romain Esse almost scoring with his very first touch, but saw his shot blocked.
The youngster was desperately unlucky later on, seeing one attempt strike off each posts before being gathered on the line. Uche then blazed a sitter of a chance, indicating there is still room for development in his game.
A solitary 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 senior debut, capping an otherwise perfect night for the traveling side.
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