The aforementioned source claims that the wantaway striker asked manager Jose Mourinho for special dispensation to fly home to be there for the birth of his and partner Melanie Da Cruz's son.
Martial already has one child, two-year-old Peyton, from his previous relationship with Samantha Jacquelinet.
Renowned for being something of a fmaily man, Mourinho was receptive to the request and allowed Martial to leave the camp.
However, the situation has come at an awful time for both player and club.
Martial is said to want out of Old Trafford after growing tired of his lack of opportunities under the Portuguese, who in turn is frustrated with Martial's sub-par performances.
However, the main interest being shown at this moment in time is from Tottenham and Chelsea, with United known to prefer sanctioning an overseas move.