After their Western Conference semi-final defeat at the hands of Houston Dynamo, Keller reflected on the season and overall was content with how the Sounders performed in just their first campaign.
"We're pretty happy. It's not real easy right now, because we felt we could've won the whole thing. But at the same time, we won the Open Cup, we attributed ourselves really well," said Keller.
"The city was phenomenally behind us, and now we have to take the pill of not winning this tie and go out and spend the offseason thinking how we're going to make it better."
In regards to the loss to Houston, Keller was disappointed but prepared to move on after being knocked out by a brilliant Brian Ching goal.
"You lose in the playoffs and there's no tomorrow, and unfortunately there's no tomorrow for us," he added.
"But all credit to Houston, they kept battling, and Brian (Ching) scored one of the best goals he's ever scored... It bounced kindly for him, Brian turned inside of it and put it right in the upper corner. You couldn't have asked for a better place for it.
"You've got to give Brian a ton of credit. It was a fantastic finish and a goal worthy of winning any game."