Kenny Shiels the League Cup Final, where they upset the odds by beating Celtic 1–0, with Dieter van Tornhout scoring the crucial goal in the 83rd minute. Killie's joy was tempered by the death of Liam Kelly's father, Jack, who suffered a fatal heart attack at the final whistle of the game. On the win, Shiels stated the team "are thinking more about Liam (Kelly) than our triumphalism". He then told BBC Scotland's Jonathan Sutherland, winning the cup is "unbelievable", in addition "a great emotion" for the Kilmarnock's supporters. Following his side's historic cup win, Shiels announced his intention to stay at
Kenny Shiels at the end of the season. Alongside his club jobs, Shiels was also employed by the Irish Football Association to manage the Northern Ireland national under-17 football team, a role he retained, until 2007, when new senior manager Nigel Worthington brought in his own men at youth levels. Shiels took charge of Larne for the 2005–06 season and took the club to two cup semi-finals, but his full-time job with the IFA meant that he was unable to fully devote his time to the club and so he stood down at the end of the season. Shiels joined Tranmere Rovers