The trio are currently on international duty with Argentina ahead of their forthcoming friendly against Hong Kong on Tuesday.
Rojo posted the picture above on Instagram and wrote: “Listening to some music with the boys @enzonicolasep and @ghiguain20_9.
The defender has made four Premier League appearances for United so far this season after joining from Sporting Lisbon over the summer.
Rojo helped United beat Everton 2-1 in their last top-flight game as they moved up to fourth place in the table.
United next face a trip to West Bromwich Albion on 20 October as they look to maintain their winning run.
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