The South Korean full-back rose to prominence during the 2012 Olympic Games, earning him a switch to Loftus Road in January.
He is highly regarded by QPR officials and staff, but will not be rushed into their first team set-up.
Instead, he will be allowed to get valuable minutes under his belt at Championship rivals Doncaster.
Dickov is delighted that Redknapp regards Rovers as the best place for Yun's ongoing development, with several second tier clubs having expressed an interest in taking a player who was heavily linked with Manchester City before securing a move to England.
He told the Doncaster Free Press: "We're lucky to have him.
"We thought he might be a little out of our range because there were some top Championship clubs in for him on loan. But Harry has been great and he's looked after us on that one.
"He'll bring a lot of energy for us, he's a top player.
"He's someone who is rated very highly in the game. QPR nicked him from a lot of big clubs."