Man United trio called out with problem area identified as Ruben Amorim arrives

Emmanuel Petit has urged the Manchester United trio of Alejandro Garnacho, Amad Diallo and Marcus Rashford to step up as new manager Ruben Amorim gets to work.

Despite a modest improvement under caretaker manager Ruud van Nistelrooy following Erik ten Hag's departure, United are still languishing at 13th in the Premier League. Amorim is set to introduce a new tactical approach with a three-at-the-back system, leaving players in some doubt about their roles.

Petit, 54, has pinpointed the trio of wingers as key figures who must fight for their place in the team, but he has doubts about their ability to start for United. And he has suggested their spots may even be in jeopardy if things don't improve soon.

READ MORE: Rio Ferdinand hits out at Ruben Amorim's first big United decision

READ MORE: Ruud van Nistelrooy made three United improvements Ruben Amorim can build on

"For me, the quality of players at Manchester United in some positions is not good enough," the former Arsenal and Chelsea midfielder told Instant Casino (via The Mirror). "Starting from the midfield, I think they need to add quality players and wingers as well. I'm sorry, but I'm not totally convinced about Garnacho, about Amad, Rashford. He's got a lot of work to do."

Despite Petit's scepticism, Amad has enjoyed some encouraging form, scoring twice against PAOK in the Europa League on Thursday and assisting a Bruno Fernandes goal against Leicester. Garnacho also scored in Sunday's win over the Foxes and leads United with seven goals in all competitions this season.

Rashford's form has been a major talking point, with the academy graduate facing a barrage of criticism for his lacklustre performances. The Englishman failed to register a single shot