The England international full-back has been disappointed with recent results and revealed that some strong words were spoken following Saturday's 4-2 defeat against Arsenal at Villa Park.
With Villa in 15th position in the Premier League table, Warnock insists they must start picking up maximum points again very quickly.
"There were harsh words from the lads," he said.
"As we came in at half-time we knew it wasn't good enough.
"People were shouting at each other and trying to say as much as they could to try and get back into the game.
"It is a tough time because we have lost a couple on the spin but we have to be strong mentally now."
A trip to derby rivals Birmingham beckons for Villa in the Carling Cup quarter-finals on Wednesday and Warnock hopes they can pick up a confidence-boosting win at St Andrew's.
He added: "When you have been beaten you want to play any game as quickly as possible and try and get back on the field," he continued.
"The fact it is a derby it is a massive game.
"Getting one over your local rivals is a nice feeling and we will be hoping to do that."