The 25-year old, who captained the Tigers to promotion from the Championship last season, has spent the first half of this term on loan with Forest but is now the subject of a significant bid from Reading.
"We will be calling Jack and the ball is now in Nottingham Forest's court. He is available, we've said that to everybody and we'll see what happens.
"My job is to look after the interests of the club and if somebody is offering us a lot of money then we have to look at it, it's as simple as that.
"We obviously let him go on loan as there were doubts about his knee and we understand that.
"He has gone there and done very well, but if they think they are going to get him for nothing, then we've got a decision to make."
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