Speaking before United's clash with Southampton, Mourinho stated that he was pleased with Martial's recent performances in the Premier League, and reports suggest that a berth in United's starting XI could be on the cards for the 21-year old.
"Yeah, he was good, he was good," said Mourinho of Martial's performance at Spurs.
"He was okay against Arsenal, he was okay too.
"Against Celta he didn't play because the options were different but he's fine, he's fine and he's one of the guys for who it's very important to play 90 minutes.
"Smalling, Jones, Mata, it's very important for them to play 90 minutes."