The sides had agreed to terms and were waiting to complete a physical and final paperwork. Giants general manager Brian Sabean is committed to keeping his talented pitching staff intact -- and not just aces Tim Lincecum and Matt Cain, who he hopes to lock up in long-term deals.
Mota, a 38-year-old right-hander, has become a reliable option for manager Bruce Bochy. He went 2-2 with a 3.81 ERA in 52 outings last season for the NL West runners-up.
Mota's 80 1/3 innings last season were his third highest in 13 big league seasons and most since 2004, when he pitched for the Los Angeles Dodgers and the Marlins.
Mota made one appearance against Texas during the 2010 World Series, when the Giants wrapped up the franchise's first championship since moving West in 1958.
With Mota returning, Bochy has much of his bullpen intact. In late October, San Francisco gave left-handed reliever Javier Lopez an $8.5 million, two-year contract and also picked up the $5 million contract option for fellow lefty reliever Jeremy Affeldt.