This week, the Brazilian had to be taken off after just 36 minutes of their midweek match, looking absolutely shattered.
When he took his place on the bench, still looking in great distress, the 26-year-old called the Internacional coaching staff for assistance.
He was then fitted with a mask and given immediate oxygen on the touchline.
Inter were playing in Laz Paz, Bolivia, which is famed for its high altitude. They lost 3-1 to The Strongest.
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