The USA international, a star turn on the night with several stunning saves, insists there will be no negative hangover when Manchester United visit on Sunday.
"If anything it should motivate you," he said after the game. "You should channel that anger and disappointment into your next game. Physically it is not a problem - we've got three of four days before the next game.
"For me personally, anger is a fantastic motivator. You just go out, take everything you can and bounce back from there.
"It was a bit wild out there, but unfortunately it just came up wrong for us at the end. It was a great effort from everyone involved."
Kasey admits that he was suspecting the momentum might be with him going into the penalty shoot-out following his late heroics.
"I was hoping, you feel like you can deal with everything else and it is a shame that it came down to penalties. We couldn't quite hold out in normal time, the way Ricketts got in for that goal - Carry came across, it basically hit him on the backside and fell just right for him. When it is not bouncing right, it is not bouncing right - it fell good for him and they equalised."
Kasey Keller says the disappointment of the penalty exit from the Carling Cup must be channelled into becoming an added motivation for the challenges ahead.