The South Korean midfielder has claimed that he made the decision to leave Old Trafford after seven years, as the 31-year-old looks forward to a new challenge with QPR
The South Korean officially signed for the Loftus Road club on Monday, and stated that he was not forced out of the club where he won the Champions League and four Premier League titles.
"I was the one who said I wanted to leave the club because I’d had a great offer," Park told reporters.
"I was the one who said it to Manchester United. It was a difficult decision because United are a good club and everybody wants to play there."
The midfielder was the first South Korean to play in the Premier League, with many speculating the player wouldn't be able to cope playing at a higher level of football, and was a player bought primarily for commercial gain.
However, after proving the doubters wrong the 31-year-old is now looking forward to a new challenge at Loftus Road.
He added: "Last season I didn't play as much. I would still have had a good chance to play for Man United, but QPR made me a very good offer and their ambitions and plans were interesting for me.
"That's why I made the decision to leave. If QPR hadn't explained their future I might have stayed.
"It is a big step to leave United but it is important to understand this is about another challenge in my life."