The English forward has silenced doubts over his form with a string of impressive displays for the Catalan giants.
Rashford joined Barça in the summer after falling out of favour under former United manager Ruben Amorim, having spent the second half of last season on loan at Aston Villa.
His move sparked a fierce battle for his signature, with several clubs keen, but it was Hansi Flick's side that ultimately secured his services.
Since arriving at the Camp Nou, Rashford has delivered eight goal contributions in his last seven matches, reaffirming his reputation as one of Europe's most dynamic attackers.
Even in Barcelona's recent 4-1 defeat to Sevilla, the forward was on the scoresheet and among their brightest performers.
The England international has received glowing appraisals from teammates and pundits alike, who believe he is thriving under Flick's guidance.
"The important thing is that he gains confidence, and scoring two goals in this stadium, in his home country, will help him," Flick said after Rashford's brace against Newcastle in the Champions League.
"We're helping him. But I'm not surprised. He's an outstanding player, with great talent, as I said. His finishing is fantastic. We need a player like him."
His Barcelona team-mate Ronald Araujo added: "Marcus is spectacular. He does the same thing in training. We're very happy to have him with us, because he has a lot of quality and will help us a lot."
La Liga served up a gripping weekend of twists on Sunday, as Robert Lewandowski's hat-trick inspired Barcelona to a 4-2 victory over Celta Vigo, cutting Real Madrid's lead at the top to just three points after their stalemate at Rayo Vallecano.
Matthijs de Ligt rescued Manchester United at the death with a 96th-minute header to earn a thrilling 2-2 Premier League draw against Tottenham Hotspur at the Tottenham Hotspur Stadium.
Bryan Mbeumo could soon face one of the biggest decisions of his career, whether to represent Cameroon at the 2025 Africa Cup of Nations in December or stay with Manchester United during a defining period of their Premier League campaign.
Tottenham head coach Thomas Frank has heaped praise on Manchester United winger Bryan Mbeumo, describing his former player as "close to the complete winger" ahead of Saturday's Premier League clash in North London.
