The midfielder has been on the transfer list at Molineux ever since the club were relegated to League One at the end of last season.
However, despite his recent positive performances for the club's development side, Jackett has admitted that "no enquiries" have been lodged regarding the availability of the 27-year-old.
"We've had no enquiries about him whatsoever," Jackett is quoted as saying by the Express & Star. "Every time he's played for our Under-21s he's been very impressive and put in some good performances.
"Even if you went there to watch someone else, you'd see a good performance from him. So it's surprised me there's been no interest in him."
O'Hara is thought to have recently changed his agent in a bid to drum up some interest in his services.