The 2007–08 season provided Buckley with increased game time, starting four of the first six matches in the Celtic League, followed by making his Heineken Cup debut against the London Wasps. It was during this match that Buckley came on for the injured John Hayes and within minutes had put Simon Shaw to ground with a hand-off on his own line. After another disappointing season in which he lost his place in the Irish squad to Mike Ross and Munster failed to qualify for the Heineken Cup quarter-finals for the first time in over a decade, Buckley decided to join Sale Sharks for the 2011/12 season.