United can still receive offers for players after Thursday, but will not be able to pursue targets to replace Pogba.
Pogba has reportedly endured a falling out with United manager Jose Mourinho after he refused to cut his holiday short to return to pre-season training early, fuelling rumours that the 25-year-old could be set to leave Old Trafford this summer.
Other key factors in this operation which could work in Barca's favor are the apparently strained relationship between Pogba and United boss Jose Mourinho, and the French midfielder's fervent desire to play with Lionel Messi, something which he has reiterated on a number of occasions.
World Cup-winning Pogba is back at Carrington after he was allowed an extended break following the tournament in Russian Federation.
"We respect the player and the teams they are on".
"Why? Because it's closed for a month, where he can only think about football".
However, the report states Pogba is not to the point where he wishes to force a transfer, with three years left on his contract at Manchester United.
The fact Raiola, who was in the north-west yesterday, is trying so hard will only increase the belief the players wants out of United after just two years. There is also no indication at this stage that Pogba is willing to agitate for a transfer.
But, Gianluca Di Marzio.com claim Barcelona have made the first move to sign Pogba by offering a player the club knows United would like. Everton have lined up Mina as a back-up if they can not sign Rojo but face competition from Lyon.