The former Portsmouth manager has admitted that the Rs are resigned to losing their impressive French striker should they get relegated from the Premier League this season
The Rangers' fight for Premier League survival is looking bleak as they remain seven points off safety with only six games of the season remaining.
Since arriving at Loftus Road in January, Remy has scored an impressive five goals in seven starts, which in turn has prompted interest from a host of clubs across Europe.
"I would have thought it would be hard to hang on to Remy. He was someone we were chasing when I was at Spurs," Redknapp told Sky Sports.
"Every goal he has scored here has been a fantastic goal. He has five goals in seven games."
Remy signed for QPR for a reported €10 million from Ligue 1 outfit Olympique Marseille but has already admitted he may leave the west London side whether they are relegated or not.
Redknapp continued: "Over the season he would get you 20 goals in the Premier League. And a 20-goal-a-year man is going to be hard to hang on to.
"We have to make sure we stay up if we want to keep him. That's the key, although I haven't discussed it with him or the owners."