Having passed a final test Saturday in Tampa and being free of discomfort Sunday and yesterday, Joba Chamberlain expects to be activated from the disabled list today. Chamberlain hasn’t worked since April 27 because of a strained right oblique muscle. He made one minor league rehab start for Triple-A Scranton/Wilkes-Barre and has been throwing in simulated and extended spring games in Tampa. “If you are throwing 95 to 96 [mph] at 10:30 in the morning, you are usually OK,’’ Chamberlain said of his activity Saturday in an extended spring game against the Pirates. When Chamberlain went on the DL, he was working the seventh inning in front of David Robertson. However, without Chamberlain, manager Joe Girardi called on Shawn Kelley, who has been tremendous. Following a shaky April, Kelley has dominated in May. In 10 games this month, Kelley worked nine innings, allowed five hits, three runs and fanned a whopping 18. The lone walk was intentional. “I have pitched in every situation,’’ Chamberlain said. “At this point they can’t throw anything new at me.’’ Girardi doesn’t have a set role for Chamberlain, but values adding a power arm to the bullpen. “If [David Robertson] needs a day off I wouldn’t be afraid to use [Chamberlain] in the eighth inning. It just gives us more depth,’’ Girardi said. “A lot of the close games that we have been in it’s good to have another power arm like that where you can share the workload.’’