The Mariners have yet to announce the signing, which will become official once Bloomquist passes a physical exam.
Bloomquist, a Washington native who spent the first seven years of his career with the Mariners, appeared in just 48 games last season for the Arizona Diamondbacks due to injuries and hit .317.
The 36-year-old is one of the more versatile players in the game, though, having appeared at every position except pitcher and catcher during his career.
Bloomquist would likely provide depth in the middle of the infield for the Mariners, who have youngsters Nick Franklin and Brad Miller at second base and shortstop, respectively.
Through a 12-year career with the Mariners, Kansas City Royals, Cincinnati Reds and Diamondbacks, Bloomquist owns a .271 average with a .320 on-base percentage, 103 doubles, 17 home runs, 207 runs batted in, 131 stolen bases and 381 runs scored.
12/02 15:44:42 ET