Jaso, 32, has experience at catcher, first base and both corner outfield spots, but will likely serve as the left-handed hitting half of a first-base platoon for Pittsburgh. The team has Mike Morse, Jason Rogers and Sean Rodriguez in the mix as right-handed options at the position, with recent signee Jake Goebbert serving as another left-handed option.
Jaso spent last season with the Rays, hitting .286/.380/.459 with five homers and 22 RBI in 70 games. He has spent his entire career in the American League, hitting a lifetime .263/.361/.406 in seven major-league seasons with the Rays (2008-11, 2015), Mariners (2012) and Athletics (2013-14).
With Jaso signed, the Pirates are likely done making moves to replace Pedro Alvarez, who they non-tendered at the beginning of the month. Pittsburgh has been linked to Mitch Moreland in trade talks with Texas, though it appears that is no longer a match.