Martial has been pushing for a start in recent weeks after delivering impressive, goalscoring cameos against the Hammers and the Swans, and Mourinho has seen fit to hand the Frenchman a chance to claim a regular starting spot against the former Premier League champions. "I am happy for them, for Marouane, for Jesse, for Marcus", he said.
Mourinho stressed that he was "not getting carried away" by his side's blistering start to the season, adding: "Three matches, nine points - it's good, but it's three matches".
Captain Wes Morgan and star striker Jamie Vardy suffered back and foot injuries during Leicester's 2-0 win over Brighton but both have managed to recover in time to face United, who secured a 4-1 victory over the Foxes in the same fixture last season.
"The difference is the quality of our football, we're playing better now and if we hadn't won this match I wouldn't have anyone to blame". "But it's three matches".
"We had a very good pre-season".
He credited their form to a successful preseason campaign in the United States, adding: "We worked really well, had great conditions to work together in a handsome atmosphere in Los Angeles".
"We played against good teams, the best team in the world (Real Madrid) twice".
"When you start playing every two days, every three days, it's more based on what you build during pre-season and what you build during these weeks that are not going to be repeated".
United racked up 22 shots in a match that also saw Romelu Lukaku have a penalty saved by Leicester goalkeeper Kasper Schmeichel, who produced an inspired performance.
The Foxes have visited the Emirates Stadium and Old Trafford so far this term and host champions Chelsea in their first game back after the worldwide break. "We have to regroup when we get back and go again". Is (Jamie) Vardy a very unsafe player?
"There's speculation about quite a lot of our players but that's all it is - speculation", Shakespeare said. We worked really well. "We'd like to add to the squad".