In a boost ahead of Saturday’s Premier League game against Brentford at Old Trafford, the trio were all pictured taking part in Thursday's session at Carrington.
Morocco international Mazraoui was substituted at half-time in our 0-0 draw at Aston Villa, due to illness, but is now back in training.
Garnacho and Amad were also in the training group after shaking off the knock and illness, which kept them out for Argentina and Ivory Coast, respectively.
Manuel Ugarte undertook a recovery session having just returned from international duty with Uruguay, and taking part in World Cup qualifiers.