Villa face Crystal Palace in the FA Cup fifth-round replay just four days before their Carling Cup final clash with Manchester United.
“We have to be ready to play the replay,” Petrov told the Daily Star.
“Even with the final on the Sunday, we have to keep going. We believe in each other and we know we will have difficult games.”
“This club has been crying out for silverware. The first thing is to get some and then break into the top four,” added Petrov.
“People will look at it and say, ‘yes they can make it’. Well, we’ll see if we can.”