Tony Mowbray has informed suitors of winger Tarmo Kink that the tricky winger is not for sale.
The 25-year-old has made quite an impression at Middlesbrough since joining from Hungarian side Gyori ETO in August 2010.
A number of clubs have already enquired as to his availability, impressed by the speed at which he has settled in England.
Boro have no intention of parting with Kink, though, and have issued a firm hands-off warning to any interested parties.
Having already offloaded Gary O'Neil to West Ham, and with Kris Boyd's future still hanging in the balance, Mowbray admits there is no chance of him sanctioning another sale.
"I have had a few enquiries about Tarmo but he won't be leaving," he told the club's official website.
"He has a very obvious talent but he has to learn and understand the mentality that's needed to be a success in the Championship.
"To be fair, he wants to prove he can be a success here and I'm happy to give him that opportunity."