Calderwood said: "I'm obviously aware that there has been something in one or two papers but it's not so important to me.
"I know what we've got to concentrate on and that is Barnsley, so why worry about what people are writing?
"You just continue to do your job and feel that the group you've got will progress and keep you in it."
Forest have won only two of 19 league matches and are six points adrift of safety in the Championship.
"In our position in the league you've got to expect that there will be that speculation.
"If you look at the league table virtually everyone above us has changed their manager, so you'd be foolish not to think that might happen but you knew that when you went into the job."
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