The former Tottenham No1 admits he may not go round again next season.
"Nothing changes," Keller said on Friday after training. "It's the same. I want to obviously play to a standard and if I can't play to that standard I won't play any longer.
"No different from the start of the season or anything to that. Obviously disappointed with giving up a bad goal, I've given up bad goals before and if I play long enough, I'll give up another one probably."
Sounders goalkeeper coach Tom Dutra, a longtime friend of Keller's, told the Seattle Post-Intelligencer. "He's very demanding of himself. He doesn't take a day off. I can't remember the last time he took a day off. Works hard and puts it in. He was hard on himself this morning."