PHOENIX -- A's manager Bob Geren didn't bother enlisting the help of an agent or a lawyer when his boss first broached the subject of a contract extension.

"What do I need an agent for?" Geren said Tuesday. "I knew they'd take care of me."

That's how it goes down when your boss is one of your best friends. Oakland general manager Billy Beane and Geren have known each other since they were starring at different high schools in the San Diego area.

Their professional relationship was officially extended through at least 2010 on Tuesday, when the A's announced what was first reported by the San Francisco Chronicle on Sunday.

Geren's original contract was set to expire after this season. Now it includes next season and a club option for 2011.

"It's basically the same as the deal I got when I first got the job -- two years and an option," said Geren, who was promoted from bench coach to manager after the 2006 season. "I've got this year, next year, and an option. It's perfect."

Beane thinks so, too. Although the A's have added several veterans to punch up their offense since the end of last season, they're still a mostly young team at the big league level, with several highly regarded prospects expected to arrive within the next year or two.

"I think he's the perfect man for where we're at right now," Beane said. "He's taken over a team that's gone through a transition the last couple years, and we're happy with what he's done, his commitment to the job, his passion for the job, his relationships up and down the organization top to bottom.

"I hope he's here a long time beyond this contract."

So does Geren, who called the A's "the best organization in baseball."

"We have a very talented group of young players here, and we have another very talented group on the way," Geren said. "It's really exciting to know that I'll be working with them for the next few years, and I think we're all going to have a lot of success together."

Geren said he and Beane started talking about an extension before Spring Training, with Beane initiating the talks.

"It was something we were planning on doing at the end of last season," Beane said. "This was not something Bob was running around asking us about. We just waited until spring to get some things out of way. We definitely wanted to get it done before the season started."

Geren is 151-172 in two seasons at the helm, but he's rarely had a full compliment of healthy regulars; the A's used the disabled list a club-record 25 times in 2008, topping the record of 23 they set the year before.

Also, Beane was embarking on a full-blown rebuilding project at about the same time he tabbed Geren to replace Ken Macha. Since the start of Geren's first season as the skipper, Beane has been loading up on prospects by trading away established players such as Milton Bradley, Jason Kendall, Marco Scutaro, Mark Kotsay, Nick Swisher, Dan Haren, Rich Harden, Joe Blanton and Huston Street.

"Given everything that's gone on," Beane said, "Bob's done a phenomenal job."