United, who missed out on qualification for Europe's premier club competition last season, coasted to a 3-0 victory on Tuesday, with goals for Marouane Fellaini, Romelu Lukaku and Marcus Rashford.
But Fellaini was only on the pitch because United captain Paul Pogba hobbled off in the 19th minute with an apparent hamstring injury which may keep him sidelined for the rest of the month.
The 32-year-old made his return to the fold at right-back ahead of the rested Antonio Valencia against Basel in the Champions League at Old Trafford.
When asked about the extent of his record signing's injury, United manager Jose Mourinho told MUTV: "I don't know". I didnt speak yet with him or the medical staff.
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While Mourinho was still unsure about the extent of the France international's injury, the Portuguese tactician said Pogba could be missing for a few weeks. "So if no Paul for Sunday, we have Herrera, we have Carrick, we have Fellaini and we have Matic".
He said: "I don't know, it looks like a hamstring injury". If we want to be champions, then we have to win (those) types of games (like Sunday's). Now I feel really strong, really confident.
The teenager believes United's embarrassment of riches is helping rather than hindering his and Martial's development.
'I train hard to improve every day, in every training [session], so I work really hard to be the best keeper in the world.