The Catalans have until August 31 to complete any signings.
Mino Raiola joked he will have "sleepless nights" to find Paul Pogba a new club.
The relationship between the duo is said to have hit an all-time low.
French manager left Real Madrid in June after winning three consecutive Champions Leagues.
The Spanish giants could use the same approach they adopted when they signed Philippe Coutinho from Liverpool last season.
The Frenchman's agent has reportedly offered him to Barcelona.
Chelsea are yet to name Antonio Conte's successor.
Manchester City is closing in on the first signing of the summer.
Liverpool has completed the first signing of its summer.
United completed its deals early in the transfer window.
Cristiano Ronaldo is still regarded as a hero at Old Trafford.
Any of these signings would have been massive.
Mourinho has made three signings so far this summer.
The Premier League's biggest teams have kicked off the season, and now they know where their weaknesses lie.
United is seeking a left winger.
United won't be held to ransom over transfers.
The winger looks to be on his way from Inter Milan.
The Englishman returned to Everton earlier in July from Manchester United with forward Romelu Lukaku moving in the opposite direction in a big-money deal.
De Gea almost moved to Real two summers ago.
Winger Ivan Perisic looks unlikely to go to United this summer.
Spurs are determined to hold onto England international Eric Dier.