In 2006, he finished third in his opening heat of the 1000 metres and fifth in his opening heat of the 1500 metres, failing to advance in both. In the 2010 Olympics, he finished fifth in his opening race of the 1500 metres, but was advanced to the semifinals, where he finished seventh, failing to advance.
Mattei competed at the 2006 and 2010 Winter Olympics for France. He was also part of the French 5000 metre relay team, which placed third in the semifinal, but was advanced to the final, where they finished 5th. As of 2013, Mattei"s best performance at the World Championships came as part of the French relay team in 2004, which finished 6th.
His best individual performance also came in 2004, in the 1000 metres.
As of 2013, Mattei has one International Skating Union Short Track Speed Skating World Cup podium finish, a bronze as part of the relay team in 2006-2007 at Heerenveen. His top World Cup ranking is 13th, in the 1500 metres in 2003-2004.
