Randy Johnson might soon be chasing his 300th win in San Francisco next year, as he’s considering playing for the Giants in 2009.

The 45-year-old left-hander is keen on extending his career, and he will consider pitching in either San Francisco or Oakland next season, according to a report in the San Francisco Chronicle.

A local from nearby Walnut Creek and a graduate of Livermore High School, Johnson is familiar with the territory and has pitched and excelled in both American and National Leagues. Last season, Johnson went 11-10 with a 3.91 ERA in 30 starts for the Diamondbacks while pitching in his 21st big league season.

But the Giants and A’s would not be alone in pursuit of Johnson, as there have been a number of inquiries.

“We’ve had about 10 teams contact us,” said Barry Meister, one of Johnson’s agents. “We’ve had discussions with a lot of teams in general, including the Giants. The Giants have expressed interest in us.

This actually wouldn’t be such a bad move for the Giants. They have a spot open in their rotation because they chased off Kevin Corriea, and their two top picks from the 2007 draft (Madison Bumgarner and Tim Alderson) are still a year or two away from joining the big league club. Even at 45-years old, a team could do a lot worse than the Big Unit. And with CY Young Winner Tim Lincecum, as well as improving youngsters Matt Cain and Jonathan Sanchez at the front of the rotation, maybe Johnson can mask Barry Zito’s awful performances. (He would also be a hell of a lot cheaper than CC Sabathia, who the Giants have been linked to as well this offseason.)