The former Forest forward made the comments on Thursday following Dougie Freedman’s side’s 3-1 defeat to Watford at the City Ground in the Championship on Wednesday.
“The comment made by Dougie Freedman about the players being tired for all their effort they have put in, I don’t buy that. I think if you tell a player that he is tired, then he will feel tired.
"I think it is a bit unprofessional if you let your season peter out, even if you can’t get into the playoffs, even if you can’t get relegated, not just for Forest, for anybody.”
Forest are currently struggling for points and for form, and could miss out on a top-10 finish in the Championship this season.
The Nottingham-based outfit have lost four of their last five league matches, drawing the other. In fact, the Reds’ last win was against Rotherham United at the City Ground on March 18.
While injuries have played a role in Forest’s recent poor results, the issue that they have been able unable to step up against the better sides also need to be addressed.
Forest went down 3-1 at Norwich City last month, and suffered defeats to Wolverhampton Wanderers and Watford at home this month.
Freedman’s side, who are currently 10th in the Championship table with 58 points from 43 matches, will take on Blackburn Rovers away from home at Ewood Park this afternoon.