Despite embarking on their maiden continental campaign, Crystal Palace are adapting very quickly. Missing star players like forward Jean-Philippe Mateta and defender Daniel Muñoz, the Eagles left Dublin with a comfortable result that virtually guarantees them a spot in the Europa Conference League playoffs.
A further victory in their upcoming match against Finland's KuPS ought to be sufficient to secure direct passage to the last 16, particularly following a previous stumble against Strasbourg.
This match offered a chance for several Palace's fringe talent to shine. Christantus Uche, making only his second start after arriving on loan from Getafe, opened the account with a well-taken finish. Forward Eddie Nketiah contributed a another, scoring for the second consecutive succession.
The Shelbourne side that had finished their domestic season proved outmatched against a largely second-string Palace outfit. The Londoners were further depleted by the news that Mateta and Muñoz are out with knee problems.
In spite of heavy rain in Dublin, Palace rapidly took control. A flowing passing sequence in the 11th minute, initiated by Daichi Kamada's incisive pass, let Nketiah to lay on Uche for a straightforward tap-in.
Youngster Adam Wharton came close soon after, fizzing a long-range effort over the bar. Nketiah then appealed for a penalty after racing into the box, but the official waved away the protests.
The formerArsenal striker did not have wait long to find his goal, tapping home from close range after Uche's effort had hit the post.
Shelbourne were clinging on desperately. Defender Kameron Ledwidge was lucky to escape a booking for two robust tackles 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 weaved past a series of comically weak challenges before calmly slotting a shot past goalkeeper Wessel Speel to extend the lead to 3-0.
After the break, coach Oliver Glasner seized the opportunity to withdraw several individuals like Kamada and Wharton. Replacement Romain Esse almost scoring his very first touch, but saw his effort blocked.
The youngster was incredibly unlucky later on, seeing one shot strike off each posts before being gathered on the line. Uche then missed a glaring chance, showing there is still room for development in his game.
The only concern for Palace was a late injury to Justin Devenny, who limped off. This allowed 17-year-old striker Benji Casey to earn his senior debut, rounding off an otherwise perfect evening for the visiting side.
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