The Spanish midfielder left United to join PSG on a free transfer last summer, five years after moving to Old Trafford for £29million.
"It was not about money," Herrera insisted to The Athletic. "It was not about the duration of the contract offer. In my opinion, I waited too long (for an offer) and deserved more attention from the club.
"I was a player that gave everything. I never complained. I never went to the media to complain about anything. I never put a bad face to any manager, to any member of the board, and they waited until I had five or six months left on my contract.
"That's why I had some disagreements with them."
Asked whether he would have extending his contract had an offer come sooner, Herrera replied: "Yes, absolutely. I thought they were going to come two years before my contract finished, like most other clubs do."
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