Gustavo Lionel Siviero (born 13 September 1969) is an Argentine former professional footballer who played as a central defender, currently the manager of RCD Mallorca B.
Born in Laguna Paiva, Santa Fe Province, Siviero began playing professionally with Club Atlético Colón, moving in 1991 to Colombia with América de Cali.
In summer 1998, he signed with La Liga club RCD Mallorca alongside Lanús teammate Ariel Ibagaza (another Argentine, goalkeeper Carlos Roa, had done the same move the previous campaign);[2] possessing an Italian passport, he did not count as a non-European Union player.
[4] In July 2002, aged 33, Siviero moved to Albacete Balompié also in Spain, reuniting with Roa,[5] with the pair being instrumental as the Castile-La Mancha team returned to the top division in their debut season after a seven-year absence.
[14] On 30 September 2019, after nearly two years out of the game, Siviero returned to the dugout with last-placed Enosis Neon Paralimni FC of the Cypriot First Division, his first job outside of Spain.
[15] He left the following January and was close to a return to Hércules weeks later, which abruptly collapsed due to a vote of confidence in caretaker manager Antonio Moreno.