Guillermo Pereyra

Born in Río Cuarto, Córdoba, Pereyra began his professional career at Club Atlético River Plate, helping the club to four Primera División titles during his spell there. In January 2004 he was transferred to RCD Mallorca in Spain, eventually becoming an undisputed starter for the La Liga side and making his debut in the competition on 8 February by coming on as a 63rd minute substitute in a 0–3 away loss against Sevilla FC. In March 2008, Pereyra moved to FC Lokomotiv Moscow, but the Russians decided to terminate the deal shortly after, and he subsequently joined BSC Young Boys on 11 February 2009, initially until the end of the season. Pereyra returned to Spain in late August 2009, penning a two-year deal with Real Murcia from the second division after arriving on a free transfer. For the following campaign, after the team's relegation, he returned to his country and signed with San Lorenzo de Almagro.

He is the older brother of the Argentine footballer Federico Pereyra.