Gearrin (shoulder) will throw a bullpen session Tuesday, and if all goes well, he will head out on a rehab assignment, Amy Gutierrez of CSN Bay Area reports.

EDGE Analysis

Gearrin has been slowly rebuilding strength in his right shoulder over the past several weeks, and now appears on the verge of joining a minor league affiliate. The 30-year-old was pitching well before landing on the disabled list, posting a 3.89 ERA, 1.14 WHIP and 14 holds in 41 appearances. It's hard to imagine he'll be in the mix for saves at any point this year, however, with Hunter Strickland and Sergio Romo looming as the top options behind closer Santiago Casilla.