The 22-year-old joined the Championship outfit on loan from Premier League club Aston Villa last month for the rest of the season.
Gardner has made three appearances for Forest so far and was expected to play against Millwall at the City Ground on Saturday.
However, the youngster did not even make the substitutes’ bench for the Championship clash. Prior to kickoff, Gardner took to Twitter to explain why he could not take part.
So gutted to miss the game after a sickness bug last night, but will be looking out for the score come on you reds!!— Gary Gardner (@22Gards) January 31, 2015
Come on boys!!— Gary Gardner (@22Gards) January 31, 2015
Gardner was clearly disappointed to have missed out and was cheering Forest on against Millwall, but in vain.
Ricardo Fuller’s goal in the 83rd minute proved to be the difference between the two teams at City Ground, as Forest went down 1-0.
The result leaves Stuart Pearce’s Forest side 12th in the Championship table with 34 points from 28 matches, while Millwall remain third from bottom with 27 points.