Manchester United should spend big to bring Borussia Dortmund's Jadon Sancho and West Ham United's Declan Rice to the club, according to former Red Devils midfielder Owen Hargreaves.

The 20-time English champions are said to be confident of securing a deal for Sancho in next summer's transfer window, while Rice has also been linked with a move to Old Trafford.

Hargreaves has claimed that Sancho "would be a perfect player" for Ole Gunnar Solskjaer's side, while the former England international has also called for Rice to be a big-money target.

"Sancho would be a perfect player for this team," Hargreaves told BT Sport. "And they need a No.9 - whoever that might be. At some time they are going to have to invest because we have seen [Manchester] City and Liverpool, they've bought players who have made a real difference.

"Eventually you have to buy. Declan Rice fits in here, whether he costs £50m or £60m. He fits the mould of young and British.

"Jadon Sancho is nailed on for this team. Even if he costs £120m, he is there for a decade so you almost can't overspend on him. When you buy, buy players who will play. They cannot afford those misses any more."

Mason Greenwood scored his first senior goal as United recorded a 1-0 win over Astana in their Europa League Group L opener on Thursday night.

Solskjaer's team will now look to make it three straight victories in all competitions when they travel to West Ham United in the Premier League on Sunday afternoon.