The South Korean star was adviced by his former boss Guus Hiddink to join Chelsea.
“When I made my mind up for Manchester I felt that I had betrayed Hiddink,” admitted Park.
“I knew that Hiddink wanted me to stay (and then go to Chelsea later), so I found it difficult.”
Park joined United in a £4million deal in 2005 and has become a key player at Old Trafford.
