This comes from Baseball Digest Daily as well as the Rays official site

ST. PETERSBURG, Fla. -- The Tampa Bay Devil Rays have agreed to terms with right-handed pitchers Stephen Andrade and Tony Peguero; infielders Hee-Seop Choi and Jorge Velandia; outfielder Dustan Mohr; and catcher Yamid Haad on minor league contracts with invitations to major league spring training, it was announced today.
Andrade, 28, owns a 2.76 ERA in 226 career minor league outings striking out 424 batters in 319.0 innings while walking only 112. He was selected by the Rays in the 2005 Rule V Draft from Toronto and was immediately traded to San Diego for cash considerations then later claimed off waivers by Kansas City in spring training. He made his major league debut last season appearing in four games with the Royals allowing five runs in 4.2 innings pitched.

Peguero, 25, re-signs with Tampa Bay, the organization that originally inked him as a non-drafted free agent in 1999. He was 10-12 with a 2.97 ERA last season at AA Montgomery throwing a career-high 151.2 innings. He has worked to a career mark of 42-40 and a 3.78 ERA over seven seasons in the Rays system.

Choi, 27, has a .240 career average in 363 major league games with 54 doubles, 40 home runs and 120 RBI with the Cubs, Marlins and Dodgers. Last season, the first baseman batted .207 in just 66 games at AAA Pawtucket (Boston) while battling a right knee strain and a lower back strain. A native of Chon-Nam, South Korea, he and Rays pitcher Jae Seo were high school teammates.

Velandia, 31, has appeared in 150 major league games over parts of seven seasons with the Padres, Athletics and Mets. Last season, he batted .291 with 25 doubles, 10 home runs and 56 RBI in 122 games with AAA Charlotte (White Sox).

Mohr, 30, appeared in 21 games last season with Boston batting .175 with two home runs. He owns a .250 career batting average with 78 doubles, 48 home runs and 154 RBI in 497 major league games over parts of six seasons with the Twins, Giants, Rockies and Red Sox.

Haad, 29, returns to the Rays where he spent the first half of the 2002 season with AA Orlando and AAA Durham. His most extensive major league action came in 2005 with San Francisco serving as the backup catcher after Yorvit Torrealba was traded to Seattle. He appeared in 17 games batting .071 (2- for-28) and throwing out five of 10 attempted base stealers.

Our best guess? Durham - Mohr replaces Darnell McDonald, Andrade joins Dale Thayer in the bullpen, Haad and Velandia will also fill out the roster.

Questions - Choi who knows, either AAA or the big leagues more than likely, and Peguero probably moves up to Durham as well.