ANAHEIM -- The A's announced that Manny Ramirez will join Triple-A Sacramento on Saturday to begin preparations as his 50-game suspension nears an end.

The slugger will spend his entire 10-game minor league assignment with the River Cats until joining the A's on May 30 for a game at Minnesota. His suspension for violating baseball's drug policy ends that day, which is also his 40th birthday.

Ramirez, who has spent the past several weeks playing in extended spring training games in Phoenix, is scheduled to play in Saturday's game for Sacramento. He'll stick with the River Cats through a four-game series at Round Rock (Texas), then play a four-game home series at Raley Field May 25-28 against Reno.

Ramirez will fly to Minnesota on May 29 and officially join the A's the next day.

Also Tuesday, the A's claimed left-handed reliever Travis Blackley off waivers from the Giants. To clear a spot on the 40-man roster, the A's transferred reliever Joey Devine to the 60-day DL.

They have to clear a spot on the 25-man roster but won't do so until Blackley, 29, joins the club. He is 1-3 with a 9.30 ERA in 12 career major league games (eight starts).

He will become the fourth Australian to play for the A's this year along with Grant Balfour, Luke Hughes and Rich Thompson. The A's are already the first team in Major League history with three Australian-born players.

Blackley, 29, began the season at Triple-A Fresno and was 3-0 with a save and a 0.39 ERA in four games, three starts, with the Grizzlies before the Giants brought him up on May 1. Blackley made his Major League debut with Seattle in 2004 and also pitched for the Giants in 2007.

Blackley was originally signed by Seattle as a non-drafted free agent, October 29, 2000. He spent part of the 2010 season in the A's farm system, posting a 0-0 record and 1.80 ERA two starts at Single-A Stockton and a 2-1 record and 2.52 ERA in 15 games, four starts with Triple-A Sacramento.

Bay Area News Group staff and wire services contributed to this report.