The Boro boss has been told there will be no bargain-basement departures from the Riverside Stadium this month and that the club will look for the market value for any player who goes, with defender David Wheater, out of contract in the summer, the big attraction for potential purchasers.
Mowbray told the club's official website: "There have been no concrete offers for any player, just tentative inquiries.
"The balance is always about time and finance really. The chairman has come out publicly and said no-one will be leaving on the cheap.
"There is no fire sale required, so if people do leave, it will be for the right money in either this window or the next window.
"We need to redress the salaries of the outgoings and the incomings."