Tomlin was not pleased to be withdrawn just before the hour mark during the 2-1 victory over Burnley at London Road.
He was one of the stars of last season's League One promotion campaign, scoring 15 goals in all competitions in his first full season with Posh.
However, despite a classy hat-trick in the 7-1 demolition of Ipswich last month, the 22-year-old has struggled to repeat that consistent form at Championship level.
Ferguson told the Evening Telegraph. "Lee's reaction was a nonsense. He isn't playing anywhere near his best and he's fighting himself at the moment. I don't want to concentrate on the negatives, but I will have to have a word with Lee.
"We have strength in depth at the club now so no-one's place is guaranteed. No matter who they are, if a player isn't at it in matches then they won't be in the team."