Marcus Rashford and Anthony Martial can prove to be “unbelievable” players for Manchester United, according to Dimitar Berbatov.

The pair played second-fiddle to the likes of Romelu Lukaku and Alexis Sanchez for much of last season, with Martial missing out on a place in France’s successful World Cup campaign as a result.

Rashford went to Russia with England and has played plenty of football under Jose Mourinho, although the 20-year-old failed to impress his boss when given the chance to make a mark late on in the campaign.

With minutes key to his continued improvement, Rashford needs to remain central to Mourinho’s plans, while Martial continues to be linked with a move away from Old Trafford.

The winger left United’s pre-season tour of the United States earlier this week with Mourinho confirming he left to be present at the birth of his child.

Berbatov, who starred up front for the Red Devils between 2008 and 2012, wants to see more from the United youngsters moving forward.

“I think Rashford needs more playing time so he can develop fully because he has great abilities, for me alongside Martial these two can be unbelievable,” he said.

“They are young, they enjoy the game and because of their youth they see the game differently to other players.”

Berbatov played for United from 2008-12.

United’s pre-season tour has been something of a damp squib thus far, with three draws from their three games – culminating in a penalty shoot-out win over AC Milan on Wednesday.

There are a number of players missing, those who played in the World Cup and injured skipper Antonio Valencia, but Berbatov is hoping to see Rashford and Martial play alongside one another at some point.

“Some people say they cannot play at the same time but I disagree,” added the 37-year-old Bulgarian, who bagged 56 goals in 149 appearances for the club.

“They don’t over-think things, they just go and play and enjoy the game as much as they can – they are quick, strong, have great technical ability and they can score goals.

“So I hope that more time is given to Martial and Rashford which I think will be beneficial to the whole team and to them as well obviously.”