The England international has featured regularly under Jose Mourinho since the Portuguese head coach took over the reins of Manchester United in May 2016.
Rashford burst onto the scene with eight goals in 18 games before Mourinho replaced Louis van Gaal at the 20-time English champions.
While the 22-year-old has played in a lot games under the former Chelsea FC manager, 38 of his 75 appearances in the Premier League have been as a substitute.
Mourinho made the surprise decision to drop Romelu Lukaku in favour of starting Rashford for their 2-1 win over Everton at the end of October.
However, the English talent was once again a substitute at Bournemouth on Saturday but proved his point to the manager with an added-time winner to seal a 2-1 victory.
Rashford has now scored two goals and has made one assist in eight appearances in the Premier League this season.
Former Manchester United defender Ferdinand believes Rashford warrants a regular starting spot in the Red Devils team to continue his development at Old Trafford.
“This [Rashford] is a great talent that needs to be nurtured,” Ferdinand told BT Sport on Saturday night.
“Mourinho has given him many, many minutes, but I believe he is at an age now where if he’s not starting he’ll be disappointed. And I think he’s good enough to start.
“In his development now I think that should be mixed up for him. I don’t think he’s at the point in his career where he’s a definite number nine.
“Remember Wayne Rooney played on the wing, a young Cristiano Ronaldo played on the wing. Young players move about a lot and then they find their position.”
Manchester United came from behind to secure a 2-1 win over Bournemouth at the Vitality Stadium on Saturday after Anthony Martial and Rashford cancelled out Callum Wilson’s opener.
Mourinho’s side will now switch their focus to the Champions League following a return of four points from their opening three games.
The Red Devils will make the trip to Turin in a crucial Champions League fixture on Wednesday night as Mourinho’s men look to secure yet another famous win in the Italian city.
Juventus were 1-0 winners against Manchester United at Old Trafford last month after Paulo Dybala scored a first-half winner in the group-stage fixture.
However, Manchester United can take some encouragement from their success in Turin in the Champions League after Roy Keane and Ryan Giggs inspired famous victories in 1998-99 and 2002-03.
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