The Owls head coach is incensed by the Italian's unfair reputation for diving.
Wednesday's Forestieri received his third yellow card in two months for simulation during Tuesday's home draw against MK Dons, though none of them were justified in the eyes of the Owls head coach.
Despite assurances from the Professional Game Match Officials Limited (PGMOL) after the second incident against Hull City, nothing has been done to address the situation with Wednesday's concerns continuing to fall on deaf ears according to Carvalhal.
And the Portuguese fears it will take a broken leg - such as the one suffered by Brentford's Alan Judge earlier this month - before the PGMOL take action.
"I must tell you the facts. We have a responsibility to our supporters," Carvalhal told BBC Radio Sheffield. "Sometimes the supporters say: ‘Carlos you are not doing nothing, Forestieri didn’t dive and the club don’t do nothing'.
"After the game against Hull we called someone from the referees (PGMOL) to talk with us. We showed him the match, he agreed with us 100 per cent. So we use the official channels to try to curb the situation - out of the press.
"He promised us: ‘We’ll talk with the referees... (and tell them) don’t put the previous image of Fernando, just analyse the situation. After this, we have the incident again and that’s why I’m talking now.
"We want to use the correct channels and ask really did they improve the situation. And if they did, why are these things happening again.
"It’s very bad to the club and the image of the player, and we are not happy with this situation. They must give to us an explanation, because we are using the correct channels.
"I’m talking now because we don’t receive any official answer to our request to talk."
Signing off an impassioned interview, the 50-year-old added: "I’m not inventing nothing. This is the reality. We don’t like to talk (about it) but we have to talk because if we don’t talk maybe our fans think we are sleeping."
Carvalhal was so incensed by Forestieri's booking, which led to the flare-up from which Ross Wallace was correctly red carded, along with the decision not to award him a "clear penalty" in the dying seconds that he stormed straight down the tunnel before the final whistle and passed his post-match media commitments on to assistant coach Lee Bullen.