After pulling off a string of saves, Kasey was finally beaten with seconds left of normal time by the rebound from his final stop of the night.
"I'm just ridiculously upset," lamented Kasey. "I made a couple of saves and I thought we would see it out or maybe sneak one at the end.
"I don't know what to say."
Kasey blocked the initial shot from Craig Bellamy before, while he was still grounded, Jermaine Jenas made enough contact with the ball for it to squirt past his despairing grasp.
"I made the save and it hit him and came back. I tried to hit it with my foot, I think I hit it a little bit but it kept spinning...
"I was steaming after the game and it is something that is definitely going to be with me for a while."
Kasey Keller was slightly lost for words after Wednesday's night's heartbreaking late defeat to Newcastle United.