Rashford, who scored for England against Spain and Switzerland during the worldwide break, had been urged by former Premier League star, Alan Shearer to quit United due to his lack of regular playing time under manager, Jose Mourinho.
At United, Rashford has Romelu Lukaku in his way at centre-forward and Alexis Sanchez occupying the left flank.
Rashford was back at Manchester United on Wednesday, likely resuming life on the margins of English soccer's biggest team.
Manchester United striker Marcus Rashford is reportedly determined to stay and fight for his place at the club despite a recent lack of first-team football.
"He's a huge admirer of him, but he's got his job to do".
"The landscape is what it is and I understand the difficulties club managers have".More news: Hurricane Florence Forecast To Shift South
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"One of the biggest concerns is playing time for English players - that is shown by a number of the squad who came with us in Russian Federation not getting opportunities", Southgate said in a press conference last month.
Gareth Southgate has warned his England players that it will be hard to pick them for next month's Nations League games in Croatia and Spain if they are not playing regularly for their clubs. They have to try to win matches.
"For me, it's the biggest club in the world, and I think he's got the potential to be one of the best".
That analysis has clearly got under Mourinho's skin, with the boss giving a 276-second answer to one question about the forward's performances for England. They have to rotate their squads.
On Rashford's woes at club level, Southgate said: "It's not my business to interfere with club managers. He's got huge competition for places at his club, so you can understand (his frustration)".
"So Manchester United supporters, for you and just for you, to know what we are doing with Marcus, Luke Shaw, Jesse Lingard, Scott McTominay, that's what we are doing here".
At just 18 years and 141 days, he became the youngest scorer for United in European competition and landmarks and records tumbled after that: scoring on his debut in the Premier League, the Champions League and League Cup, and in his first appearances for the England Under-21s and the England senior team - the youngest player to achieve that.