The 32-year-old former England worldwide, who can operate as a forward or as an an attacking midfielder, has spoken highly of the 22-year-old France global.
He has been attracting interest from Chelsea and Tottenham - but United do not want to sell to one of their Premier League rivals.
Andreas Pereira wants to stay at Manchester United this season rather than head out on loan.
Martial was given permission to fly home by boss Jose Mourinho, but the player's enforced absence means the only two strikers on United's USA tour are rookies Mason Greenwood and Joshua Bohui.
They finished sixth in 2017 and were 19 points adrift of Guardiola's Manchester City in second last season despite spending close to £300m over the past two seasons. How Mourinho would react to the club going against his wishes is unclear, though it would be no surprise if the 55-year-old voiced disquiet.
Syrian forces reach Golan Heights border according to state media
Syria criticized this evacuation as a " criminal operation " carried out by "Israel and its tools". On Tuesday, Syrian forces reached the Golan Heights frontier for the first time in seven years.
Pjanic made 28 starts in Serie A last season for Juventus, scoring 5 goals and contributing 8 assists in their title-winning season.
And, after being labelled as a No.6 by the United manager, the Belgian-born playmaker insists there is no one better to learn from.
"They will win a lot of games, don't get me wrong", Scholes told BeIN Sports.
Smalling was left out of the England World Cup squad as Gareth Southgate's players made it to the semi-finals and fourth place in Russian Federation.
"One thing is what I would like".
"This club is always linked to centre-backs, whether it's the club or agents or whoever, because the best come here".