Manchester United and Barcelona have reached agreement over the transfer of Pedro, but the Champions League holders are keen to retain the player until after next week's Uefa Super Cup.
The two sides have settled on a transfer fee of £18.1 million (€26m) initially, with a potential further £4.2m (€6m) to be paid in variable bonuses.
But the European champions face Europa League winners Sevilla in the traditional season curtain-raiser in Tbilisi on Tuesday, and want to be able to call upon Pedro to play a part.
Lionel Messi and Neymar have only recently returned from an extended break following their Copa America commitments, and neither is likely to play a full 90 minutes in the Super Cup clash.
As a result Pedro is likely to play a significant role before finalising a move to Old Trafford, meaning United will begin the Premier League season against Tottenham on Saturday without the 28-year-old in the squad.