Career
He co-authored the book Gaelic Football Training Drills () by COS Productions. He also played hurling with the St. Patricks East Kerry and Dr. Crokes clubs and the Kerry Under 21 team. O'Shea managed the Kerry Minor teams in 2002 and 2003.
Dr. Crokes
At club level O'Shea managed Dr Crokes GAA to successive Kerry County Finals in 2005 and 2006. Despite being the manager of Kerry he also continued to coach Dr Crokes in their Senior Club Football Championship which ultimately ended in defeat in the Final Replay in April 2007. Kerry
O'Shea was appointed to manage the Kerry senior football players for the 2007 season.
He named Dr. Dave Geaney of Castleisland Desmonds and Seán Geaney of An Daingean CLG as selectors. He also announced John Sugrue of Renard as his physical trainer. He also led Kerry to All Ireland final in 2008 where they lost to Tyrone, before stepping down as manager on October 16, 2008.