Remy, who is currently on loan at Newcastle United from Queens Park Rangers, is believed to be a target for a number of clubs across Europe, but Redknapp was unable to confirm whether there was a price which needed to be met to secure his services.
When asked if reported interest from Arsenal had resulted in an official offer, the QPR manager told Starsport: "I don't know the answer to that to be honest.
"I think he must have a buyout clause. I would imagine he has a buyout clause but I don't know how much.
"Someone said Everton were in for in for him too."
QPR paid a club-record £8m to sign Remy from Marseille in January 2013.