Rashford's late goal earned United a 2-1 victory away to Paris Saint-Germain last week and at Old Trafford the England striker came on as a second-half substitute and scored three times
Liverpool and Manchester City also made it six points out of a possible six in Europe this season, after Bayern needed a late Joshua Kimmich strike to claim a 2-1 win at Lokomotiv Moscow in Group A.
"I've got a lot to learn from Pep Guardiola, in the way he pressures referees, talks to opposition players and opposition dugout. He's a fantastic example. I have to learn this. We were angels compared to the other dugout,"
The buildup was overshadowed by Serge Gnabry testing positive for the coronavirus on Tuesday after he had taken part in the team's final training session for the game.
Rashford, who scored the winning spot-kick when United knocked PSG out in 2019, drilled home a low shot three minutes from the end which won a thrilling Group H contest at a near-empty Parc des Princes.
Barcelona had its first defeat under Ronald Koeman when it lost 1-0 at Getafe on Saturday, right after Madrid was beaten 1-0 at home by recently promoted Cádiz
