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Players of Argentine club San Lorenzo will turn to VIAGRA to help them in their crunch Copa Libertadores semi-final.

lead Bolivian opponents Bolivar 5-0 from the first leg, but are leaving nothing to chance as they travel to the altitude of La Paz for the conclusion of their tie.

The Estadio Hernando Siles is the highest football stadium in the world that Fifa permit international games to be held at, located some 11,932 feet above sea level.

And 2013 Argentine champions San Lorenzo, who hail from sea-level Buenos Aires, will take a dose of sildenafil citrate (also known as Viagra) to facilitate the oxygenation of blood in such extreme conditions.

The idea is that of manager Edgardo Bauza, who used the trick earlier in the tournament when San Lore were faced with a high-altitude fixture at Ecuadorian side Independiente de la Valle.

Lionel Messi vomited during his last appearance at Hernando Siles, while Angel Di Maria had to leave the field to wear an oxygen mask as Argentina laboured to a breathless draw against Bolivia in World Cup 2014 qualifying.

Here's hoping nothing expected pops up in tomorrow night's game.