[1] In the 1999 January transfer window, Montenegro moved to France with Olympique de Marseille, being loaned several times by the Ligue 1 side for the duration of his contract, mostly to teams in Spain (Real Zaragoza – where he contributed four matches to their conquest of the Copa del Rey – and CA Osasuna, both in La Liga).

He then played in quick succession for Independiente and Club Atlético River Plate, before spending parts of two seasons in the Russian Premier League with FC Saturn Ramenskoye.

[2] Montenegro returned to his main club for the 2006–07 season, going on to often act as captain and scoring in double digits in three of his first four years, including a career-best 15 goals in 2008–09.

[10] At the end of the 2017–18 campaign, in which he helped the Parque Patricios-based side qualify to the Copa Libertadores after a fourth-place league finish, Montenegro announced his retirement.

[11][12] Montenegro represented the Argentina under-20 team at the 1999 FIFA World Youth Championship,[13] and made his debut with the full side on 18 April 2007, against Chile.