Austin has entered the final year of his contract at Burnley, where his goalscoring record since joining the club in January 2011 is better than a goal every other game.
The 24-year-old netted 28 times for the Clarets last season and such form attracted the interest of Premier League newcomers Hull - only for his proposed move to the Tigers to collapse due to problems with the medical.
Clarets boss Sean Dyche admitted this week he was unsure whether Austin would still be at Turf Moor when the transfer window closes at the beginning of September.
Austin's agent, David Threlfall, insists the persistent rumours and reports regarding his client are getting out of hand.
"I've had numerous reporters call me, some of it's a bit much," Threlfall told Press Association Sport.
"I've said to them all that we aren't going to talk about it now. Charlie is still a Burnley player, he's got a year left there, and if the club aren't talking about anything then it would be disrespectful of me to do so."
Rumours surfaced on Tuesday night about Austin failing another medical, this time at Forest, but Threlfall would not be drawn on the matter.
He said: "As I've just said, I'm not going to confirm or deny anything. Our experience with Hull was embarrassing, as you'd imagine, and we've learned lessons there. If anything does materialise then we will talk about it but until then..."