Manchester United must come up with a trump card to break the deadlock in negotiations for Borussia Dortmund whiz Jadon Sancho.

The Daily Mail says a drastic breakthrough in negotiations is required if England's Sancho is to finalise a move to Manchester United within the next month.

United have trailed Sancho all summer but are making little progress in talks surrounding the agent fee for brokering a move and the player's salary.

Discussions between the two parties are ongoing, albeit slowly, and United will not negotiate a fee with Borussia Dortmund until a deal has been reached with the 20-year-old's representatives.

Dortmund value Sancho at more than £100million and want him to remain at Signal Iduna Park for the season. United want a resolution to specifics pertaining to the contract before approaching the German side.

The stagnation leaves United with a race against time if they are to land the winger in an area of the pitch Ole Gunnar Solskjaer hopes to add further quality.

They retain an interest in RB Leipzig's Dayot Upamecano as defensive reinforcement, although that move appears geared towards next summer.