Villa slipped to a shock 3-1 defeat in the first leg of their semi-final showdown with the Bantams on Tuesday, leaving them with it all to do if they are to book a day out at Wembley.
All is not lost, though, with the return leg set to be staged at Villa Park.
Pressure will be on Villa to raise their game against League Two opposition, but nerves will undoubtedly play a part in what promises to be an edgy encounter and Agbonlahor believes that means there is still all to play for.
The England international said: "We knew it was going to be tough at Bradford, especially on a big occasion for them.
"We missed a lot of chances throughout the game that on another day would have gone in.
"It is only half-time, though, we will go out sharp. Christian Benteke could have had a hat-trick and I had some chances. Their keeper made some good saves off a few of us.
"At least we have a home leg on our pitch with great support and we will have a chance of making it right.
"Their fans were good but I'm sure the atmosphere will be twice as good at Villa Park. Our fans will make sure we get the job done. It is not over yet."