However, his time at Old Trafford brought somewhat limited first-team opportunities and his playing experience in a United shirt was limited to just a two-minute substitute appearance at Arsenal in August 1999.
Three months later, he made the temporary move to Boothferry Park and made his debut in a goalless draw with Darlington, where he became the seventh custodian used by the Tigers in the 1999/2000 campaign.
He kept three cleans sheets in four appearances before returning to Old Trafford. Loan spells at Bristol Rovers and Livingston followed before he joined QPR on a permanent basis in July 2002.
However, injuries limited him to just 25 appearances for the Loftus Road outfit and ultimately brought about his early retirement from the game in April 2005 at the age of just 26.
However, he came out of retirement to join Radcliffe Borough in August 2010 and during the 2011/12 season, Culkin was placed in the NPL First Division North team of the Year, and was nominated for the Fans Player of the Year. He was also voted as the Supporters’ Player of the year on two occasions and the Club’s Player of the Year in 2012.
After an 18-month spell at Prescot Cables, Culkin joined FC United of Manchester in March 2014 and earned him the record of becoming the first player to appear for both Manchester United and FC United.