Sebastián César Helios Ribas Barbato (born 11 March 1988) is an Uruguayan footballer who plays as a forward for Montevideo City.

Born in Montevideo, Ribas began made his debuts as a senior with Juventud de Las Piedras, appearing in 17 matches and scoring six goals during his first season.

He made his first appearance for the club in the quarter final of Coppa Italia in the second leg in a 2–0 win over Empoli on 17 January 2007.

After scoring a hat-trick in a 3–2 win over Le Mans on 5 March 2011, he put his tally to 15 goals in 26 matches in the current season of Ligue 2, being the current leader of goalscorers[3] and at the end of the season, Ribas scored 23 goals, making him the league's top scorer and the club was promoted to the Ligue 1.

Manager Patrice Carteron was disappointed with Ribas contract been rejected and said in his statement:"But we can not align it could affect elsewhere.

Ribas had also struggled to settle in Italy, though, and has already found himself out of favour and was linked back to Dijon, which was denied by Carteron.

Ribas transferred to Ligue 2 side AS Monaco on 16 July 2012 in a loan deal, having left France two years earlier.

Ribas returns to South America to play for one year with an option for the club to purchase him from Genoa.