The Frenchman engaged in a war of words with United manager Ralf Rangnick after he was absent from Saturday's draw with Aston Villa.
Rangnick claimed that Martial did not want to be included in the matchday squad for the trip to Villa Park.
Martial took to social media to refute Rangnick's statement and was pictured back at Carrington for training.
The player's representative has publicly stated Martial's desire to leave Old Trafford.
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