Dean Shiels last home match of the 2008–09 season, when he scored the first goal in a 2–0 victory over Crystal Palace. Shiels scored six goals in 42 games during the 2009–10 season. However, during the 2010–11 season Shiels lost his place in the Doncaster starting line-up. He was loaned to Kilmarnock in July 2011 and his contract was mutually terminated in January 2012. Shiels signed a six-month loan deal with Kilmarnock, managed by his father Kenny Shiels, in July 2011. Shiels made his first appearance for Kilmarnock on 30 July 2011, in a goalless draw against Motherwell at Rugby Park, coming
Kenny Shiels left Carrickfergus in December 1994 to take charge of Coleraine. The 1994–95 season ended in relegation for Coleraine after the previously unitary Irish League split into a new two division set-up, Coleraine placed in the eight team First Division below the Premier Division). The season was only three games old when Shiels, who had managed the club for only thirteen games in total, was sacked by a group of club directors. Two days later he was asked to return for a single match and then following this the board decided to endorse Shiels' management for the rest of the season.