Red Sox sign veteran righthander Brad Keller, option Zack Kelly to Triple A

The Red Sox signed veteran righthander Brad Keller and plan to add him to the roster in time for Sunday afternoon's game against the Milwaukee Brewers. Keller, 28, was designated for assignment by the White Sox on May 20, cleared waivers, and became a free agent. Righthander Zack Kelly was optioned to Triple A Worcester after pitching three innings on Saturday. The other long reliever, Chase Anderson, pitched four innings on Friday.