Deportivo Toluca F.C.
In 1974, Gassire moved to Mexico where he spent six seasons with Deportivo Toluca F.C., winning the league in 1974–75. He developed brain cancer while playing with Toluca in 1980. He recovered and joined Atletas Campesinos but had an injured Achilles tendon and left after six months. He next had a brief stint at Atlético Español and then finished his career at Tampico Madero in 1983.