Universidad Católica Early career Born in
Antofagasta, Toselli joined
Universidad Católica youth ranks in 2001. He was promoted to first-team by coach
Jorge Pellicer in 2006 for the Torneo Apertura, due to the departure of second-choice keeper
Rainer Wirth to
Deportes Temuco. The following year, after a notable performance in the
FIFA U-20 World Cup, he made his club debut on 25 November, during a 3–0 home win to
Coquimbo Unido played at
San Carlos. The next season, he was challenging the goal with record-man
José María Buljubasich, becoming the first-choice keeper, after their mistakes and its departure to
Olimpia. In 2009, he participated in the
Toulon Tournament final against
France, which Chile won 1–0. Toselli suffered a bad injury that side-lined him for six months. This angered Univeridad Católica's coach,
Marco Antonio Figueroa, after risking and losing his first-choice keeper. During his recovery time, second-choice keeper
Paulo Garcés broke into the first team, relegating Toselli to the bench.
2010 season On 5 December 2010, Toselli played in the
Primera División final match against
Everton. Where his club was crowned champion after defeating the
Viña del Mar based–team, 5–0 at home.
2011 season On 11 May 2011, he regained the starting position under orders of
Juan Antonio Pizzi, after a terrible mistake of Garcés in a
Copa Libertadores quarterfinals match against
Peñarol at
Montevideo. In this match, Garcés inexplicably dropped the ball and Peñarol's
Alejandro Martinuccio took the opportunity to score, sealing the victory with a score of 2–0, in the 90th minute. After losing the playoffs finals of the
Torneo Apertura against
Universidad de Chile, was reinstated as the starting keeper by new coach
Mario Lepe, after the departures of Pizzi and Garcés. On 16 November, Toselli won the
Copa Chile final against
Magallanes. This was his second title at Católica, and it qualified his team to the
2012 Copa Sudamericana, in which
Los Cruzados were eliminated at the semifinal stage, against Brazilian side
São Paulo after two draws, where Toselli had incredible performances.
Loans On 15 December 2017, Toselli joined
Liga MX side
Atlas on loan for the remainder of the 2017–18 season. On 30 April 2018, the club announced that Toselli's loan would not be extended due to his poor performances. On 13 July 2018, Toselli returned to Chile, joining
Everton on loan, as an emergency replacement for recently departed
Eduardo Lobos, and injured
Franco Torgnascioli. On 18 February 2021, Toselli joined fellow
Primera División club
Palestino, on a one-year loan. He also extended his contract with
La Católica until the end of the 2022 season. On 6 January 2022, Toselli joined
Argentine Primera División side
Central Córdoba SdE on loan, after the club lost their two keepers
Andrés Mehring (ACL rupture) and
César Rigamonti (three broken ribs) to injuries.
Universidad de Chile On 9 January 2023, Toselli returned to Chile, joining
Universidad de Chile on a free transfer. He left them at the end of the 2025 season, but he renewed for a season on 7 January 2026. ==International career==