He played his entire career in France and England, beginning with Caen and later Rennes and Bordeaux.
He then played in the Premier League for both Manchester City and Sheffield United that was separated by a loan spell back in Ligue 1 with Marseille, before retiring in 2008 with Valenciennes.
He subsequently played for Rennes before coming to prominence with Bordeaux, where he was capped by France at 'B' level.
[3] Despite an initial run of first team games and being the first Manchester City player to score a league goal at the City of Manchester Stadium in the opening home game of the 2003–04 season,[4] Sommeil lost his place in January and had limited playing for the next two seasons.
On 19 July 2007, Sommeil left Sheffield United and signed a two-year deal with Ligue 1 outfit Valenciennes FC.