He started playing football at 18 years old, at Argeș Pitești and played his first game in A Division on 28 February 1998 against Dinamo București but unfortunately for him he was defeated twice and his team lost with 2–0. In the first season for FC Argeș 1997–1998 he played another three games. In the next season he did not get any opportunity to play and at the half of the season was transferred to Rocar București where he played 10 games. He returned to FC Argeșin 1999 but did not play too much in the next four seasons, only 17 games during this time. Starting with the 2003–04 season, Coman became the titular goalkeeper in FC Argeș's goal and played in most of the games: 22. The next season was the last for him at Argeș Pitești and at the half of season was transferred to Rapid Bucharest. In total he played 69 games for FC Argeș. At the end of his first season for Rapid București, they finished on the third place in the championship and Coman played in almost all the games, only missing one. In the next season 2005–06, Coman played in 22 games and in the end the club finished the season in second place and won the vice-champion title and the Romanian Cup after they defeated Național București in the final. In the European Cups Coman debuted with Rapid Bucharest in the 2005–06 season in UEFA Cup. This was the best season for Rapid in Europe. They succeeded to qualify in UEFA Cup's groups after they eliminated Feyenoord Rotterdam in a group with PAOK Thessaloniki, Shakhtar Donetsk, Stade Rennais F.C. and VfB Stuttgart. Rapid defeated PAOK, Shakhtar and Rennes and where defeated by VfB Stuttgart but they still qualified in the next round where they eliminated Hertha BSC after two great games by Coman. They also eliminated another German team, Hamburger SV and played the quarter final against Steaua București, their great Romanian rival. After two draws they lost the qualification against Steaua. On 13 December 2008, Coman, who was tracked by Bordeaux and Standard Liége, left Rapid Bucharest to sign for FC Brașov only to return to Rapid in the 2010 season. Coman left Rapid on 16 July 2012 to sign a two-year contract with FC Vaslui. After only one season, he left Vaslui to play for Astra Giurgiu, where he ended his career in 2015, but agreed to stay at the club as chairman.
