WATCH: Uruguay and Atletico Madrid star Jose Gimenez forced to use oxygen mask in World Cup qualifier against Bolivia with stadium located at 4,150 metres above sea level

CONMEBOL qualifiers are often considered some of the most difficult due to the loads of different conditions. However, one of the most difficult has always been playing against Bolivia due to their national stadium, El Alto's altitude of 4,150 meters above sea level. During Uruguay's 0-0 draw with Bolivia, Atleti star Gimenez was spotted needing to use oxygen from a canister to continue playing for his side.

El Alto's high altitude frequently poses a significant obstacle for visiting teams; in the past, FIFA has even tried (in vain) to limit games played over 2,500 meters. A few years ago, Argentina captain Lionel Messi had to be taken off by La Albiceleste after he vomited on the field due to fatigue related to the high altitude.

The Uruguayan will now return to Spain to train with Atletico Madrid for the Rojiblancos' clash against Espanyol on Saturday, March 29, as they look to hunt down Real Madrid and Barcelona.