SAN DIEGO -- In another move with an eye on 2009, the Padres added 24-year-old knuckleballer Charlie Haeger to their mix of pitchers, claiming the right-hander off waivers from the Chicago White Sox.

Haeger was 10-13 with a 4.45 ERA in 28 games (25 starts) for Triple-A Charlotte, the top Minor League affiliate for the White Sox. He was designated for assignment by the White Sox on Sept. 6.

"I've always felt a knuckleballer could potentially be successful here, pitching on the coast with the dense air," Padres general manager Kevin Towers said. "We're hoping he's a late-bloomer."

Haeger, the White Sox first-round pick (25th overall) in 1999, made his Major League debut in 2006. In parts of two Major League seasons, Haeger is 1-2 with a save and a 4.85 ERA.

Haeger has honed his knuckleball craft with Charlie Hough during Spring Training and later talked with Boston's Tim Wakefield about the pitch.

He is expected to join the Padres on Friday.