The 32-year-old striker was unveiled Monday by DC United after leaving Premier League side Everton and agreeing to terms with the struggling US capital team on a three-and-a-half-year deal worth a reported $13 million.
"I think it's what I needed," Rooney said. "It was the right time for me."
Rooney is due to make his debut for the club on July 14 against Vancouver when United opens its new 20,000-seat stadium, $200 million Audi Field.
"The game has grown so much over here, new stadiums, big crowds," Rooney said. "I'm excited by the project."
United chief executive Jason Levien dubbed Rooney "a living legend who is going to bring so much excitement to our fan base" and added, "To have Wayne lead us on the field into our new era is going to be glorious."
Rooney cannot sign a contract with United until the transfer window opens on July 10.
The Merseysider vowed he had not moved to MLS for a final lucrative payday.
"I'm not here to see out my last few years," Rooney said. "I'm here to compete and I'm here to win."
That could be tough at the start. United is at the bottom of MLS with two wins and 10 points from 13 matches.
"It's an exciting challenge," Rooney said. "I've watched the league from afar the past few years. We need to improve. That's clear to see. We need to get better results. This team has some young talent and they can improve with some guidance. They can learn some things from me and I can learn some things from them. New country, new culture, everything is new to me. I will embrace it. I look forward to the challenge. I'm delighted to be here."
Rooney will take a break Tuesday to watch his former England squad face Colombia in a World Cup knockout match.
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