Saarloos, 28, posted a 1-5 record with a 7.17 in 34 games, including three starts, during four separate stints with Cincinnati last season.
Following the season, Saarloos cleared waivers, refused an outright assignment and elected free agency.
This marks Saarloos' second stint with the A's organization. He posted a 7-7 record and a 4.75 ERA during the 2006 season, splitting his time between the starting rotation and bullpen.
Blue Jays: His relationship with manager Tony La Russa growing more strained, Scott Rolen expected life to be uncomfortable if he stayed with the St. Louis Cardinals.
Offered a chance with a new team, Rolen sat down to discuss things with his family. Everyone soon agreed: Rolen would waive his no-trade clause and join Toronto in a deal that sent Troy Glaus the other way.
"This is an opportunity we couldn't pass up," Rolen said at an introductory press conference. "It's a great fresh start for me in my career, and my family."
Pirates: First baseman Adam LaRoche bypassed arbitration by agreeing to a $5 million, one-year contract with Pittsburgh as the sides continue to discuss a multiyear deal. LaRoche made $3.2 million in his first season with the Pirates in 2007, when he overcame a slow start to hit .272 with 21 home runs and 88 RBI.
Mariners: Left-handed reliever Arthur Rhodes is back with the Seattle Mariners, agreeing to a minor league contract with an invitation to spring training. Rhodes missed last season with an elbow injury and had ligament replacement surgery in May.
Rays: Relief pitcher Dan Wheeler and Tampa Bay avoided arbitration, agreeing to a $2,875,000, one-year contract. The 30-year-old right-hander was obtained in a trade that sent Ty Wigginton to Houston last July. Wheeler was 0-5 with a 5.76 ERA in 25 appearances for the Rays after going 1-4 with a 5.07 ERA in 45 games with the Astros.
Dodgers: Relief pitcher Yhency Brazoban and Los Angeles avoided arbitration by agreeing to a $540,000, one-year contract. The 27-year-old right-hander appeared in four games for the Dodgers last season before undergoing season-ending shoulder surgery on June 22.