The Spanish midfielder will end his five-year spell at Old Trafford after failing to reach an agreement over a contract extension with the club, and Herrera will instead move to the French capital on a free transfer.
The 29-year-old wont officially leave Manchester United until July 1, but The Mirror have revealed that Herrera will then go on to earn over £15m annually when he joins Paris Saint-Germain during the summer.
There have been concerns from Manchester United supporters ahead of Herreras exit, but the club felt that they couldnt come close to matching his offer at the Parc des Princes following their deal with Alexis Sánchez.
Although Herrera has already played his last ever game for the club, hes backed manager Ole Gunnar Solskjaer to turn things around at Old Trafford and is confident that the Norwegian can get United back on track.
"He is one of the best people I have ever met in football. Everyone loves him in the dressing room. Everyone wants to fight for him," Herrera said.
"When you have the players behind you and wanting to fight for you, part of the job is done. I believe in karma and if you are a good person, if you are honest and sincere with the players and the fans, sooner or later it will work.
"I think Ole is the right person because he has qualities and knowledge but, also, he is a great man and a great person."