The ex-Tottenham star returned to his homeland this season to join the new MLS franchise and was delighted to be playing off for silverware so soon.
“It’s pretty cool. I think it’s great for the organization, and obviously myself, personally,” he said.
“It’s nice anytime you get to a final of any competition, it’s a great honor. I’ve come home to continue to play at the highest level, and it just continues to show that the right choices were made to be able to come home and be able to get in a cup final in the first year with a new team and we feel really great about the accomplishment.”
Keller said he expected a fierce attacking display from the opposition but was confident his Sounders could overcome them.
“D.C.’s been a very attacking team this year, and they’ve scored goals, but they’ve conceded goals,” he added.
“And we’ve been a bit of the opposite; we’ve been a team that’s kept it pretty tight at the back but different times have found it hard to score the goals.
“So it’ll be interesting to see how the two teams complement each other, or if one team really steps up its game on the day.
“We drew 3-3 at home; we were up 3-1 late and D.C. came forward and we didn’t handle the pressure well and conceded a couple of goals. So we know they’re a potent offensive team, and we have to be on top of our game defensively.”