Mourinho has reportedly told Manchester United to either sign Pogba by next week or make a move for Matuidi.
Pogba could be a United player by next week
However, Jose Mourinho is understood to be worried by the prospect of Real Madrid making a late bid to hijack United's advances.
Pogba, who left Old Trafford in 2012, is thought to be committed to signing for the Red Devils, but is nevertheless interested in a move to Real, who could yet scupper a deal for the Juventus playmaker.
United's pursuit of the 23-year-old is understood to have hit a stumbling block when Juventus refused to pay half of agent Mino Raiola's commission.
The Serie A champions were keen for United to pay Raiola since he was the one to advise Pogba on a return, although executive vice-chairman Ed Woodward appeared reluctant to budge.
However, the Manchester Evening News has now claimed that Woodward has agreed to the terms of the deal, although a frustrated Jose Mourinho has told him to complete the transfer by next week or switch attention to Paris Saint-Germain's Blaise Matuidi.
Mourinho is reportedly anxious after being rejected by Portugal international Andre Gomes, who instead opted to join Barcelona earlier in the summer.