He was described by José Mari Bakero, the sporting director of Real Sociedad, one of his former clubs, as "fast and explosive, the classic left winger but with technical discipline",[1] while he claimed himself that his speed was his greatest asset.

[3][4] European champions Liverpool attempted to sign González on loan from Albacete in the summer of 2005, but were unsuccessful as he was denied a work permit by British authorities.

[5] In January 2006, while González awaited eligibility for a Spanish passport so he could work freely in Britain, Liverpool loaned him to Real Sociedad.

González made his first appearance as a half-time substitute for fellow debutant Fábio Aurélio in a pre-season friendly away against Crewe Alexandra on 22 July.

[9] González made his competitive debut on 9 August 2006 against Israeli side Maccabi Haifa, coming off the bench in the 85th minute for Steven Gerrard and scoring an 88th-minute winner in Liverpool's Champions League 3rd round qualifier to seal a 2–1 win.

[12] González was injured inside the first ten minutes of the quarter-finals of the League Cup against Arsenal on 9 January 2007 as a result of a challenge on Theo Walcott.

He went on to score on his home debut with a penalty goal in the 1–0 victory over Champions League holders Milan in the Centenary Match in front of 55,000 fans.

However, later the same day the investigators announced that the accused was an unrelated Portuguese citizen named Mario Gonzalez, who is also allegedly a professional footballer.

[21] Originally a loan, González joined his first professional club Universidad Católica in Chile in January 2015 after spending ten years abroad.

González made his Campeonato Brasileiro Série A debut on 14 May as his team began the season with a 1–0 loss at Flamengo; he was substituted after 49 minutes for Serginho.

On 21 June 2010, González scored the only goal of the game for Chile against Switzerland during the group stage of the 2010 FIFA World Cup in his birthplace South Africa, heading in a cross from Esteban Paredes.