 He first lined out with his native county in that grade in 1993, however, Kerry were knocked out of the provincial championship at a very early stage.Ó Sé subsequently joined the Kerry under-21 team in 1994.While it was an unsuccessful year for the team in that grade, Ó Sé's nailed down his position at midfield and the following year lined out in his first Munster under-21 final.