Walsh was selected as the referee for the 2024 Scottish Cup Final between Celtic and Rangers. During the match Walsh disallowed a goal scored by Rangers for an apparent infringement on the Celtic goalkeeper. The decision was criticised by Rangers manager Clement stating "its a really big call to disallow the goal when Celtic players are grabbing and pulling my players".[4]
Walsh was selected as the referee for the Europa League match between Ajax and Qarabag in October 2024. Walsh was heavily criticised after the match for sending off two Qarabag players. Ajax went on to win the match by 3 goals to nil. Qarabag manager Gurban Gurbanov stated "I found some of the referee’s choices very questionable".[5]
Following a review into refereeing decisions made in November 2024, it was found that Nick Walsh was wrong not to send off Celtic player Hatate during a match against Kilmarnock for a dangerous challenge.[6]