After Koretski's retirement from football, he was appointed as a team delegate of
Hapoel Ramat Hasharon, and later began serving as assistant coach. In the 2012–13 season, Koretski was appointed as head coach in joint with
Benny Tabak. They both led the team to a very good performance. Few weeks before the end of the season, he was fired, after a conflict with some key players. At the end of the season, Koretski was appointed as head coach of
Hapoel Ra'anana and led the team to a promotion to
Ligat Ha'Al. Two games before the end of the season, his team secured one more season in the Premier League. Before the 2014–15 season, Koretski was appointed as head coach for
Beitar Jerusalem, and was fired on 27 January 2015. One week later, Koretski was appointed as head coach for
Hapoel Petah Tikva, and at the end of the season they were relegated to
Liga Leumit. In January 2016, while Hapoel Petah Tikva were ranked first in
Liga Leumit, Koretski decided to move to coach
Maccabi Netanya, while Netanya entered a process of
liquidation and were ranked 16th in Ligat Ha'Al. On 25 March he was fired. In 2015–16, he returned to a second term in Hapoel Ramat Hasharon, but resigned later in November. ==References==