Sean Doolittle feels the bullpen’s pain MINNEAPOLIS — Sean Doolittle is watching his friends in the Oakland bullpen struggle, and it’s tough. The injured A’s closer wants to help, but he knows his recovery from a left shoulder strain cannot be rushed. “The hardest thing is I want to help so bad and I feel so close — but so far,” said Doolittle, who is expected back later this month. The training staff has done a great job of sticking to their guns with the plan they set out a long time ago, because I catch myself getting antsy and begging to push the envelope and they haven’t budged. Oakland’s bullpen has allowed two runs or more in 12 of 19 games. “They seem to be so close every time to wriggling out of a jam or having a clean inning, and something happens,” Doolittle said. Doolittle threw a 25-pitch bullpen session Tuesday, all fastballs, and said it was the strongest he’s felt — a session of two sets of 15 pitches had sapped him last week, and, Doolittle said, It was solid, more max effort, and I was relieved to see how improved my stamina was. Melvin said there is a chance that Doolittle could throw one more bullpen session — or he might throw to hitters on Friday. Typically, that’s one of the final steps before a rehab assignment. There remains a chance the A’s will make a move to add some relief help later in the week. Coco Crisp, out all season after arthroscopic elbow surgery, is likely to rejoin the A’s on Wednesday in Minneapolis after two games of a rehab assignment. Outfielder Billy Burns was expected to be sent down to make room for Crisp, but the team is now considering keeping the rookie, who is batting .368. Susan Slusser is a San Francisco Chronicle staff writer. The best mutual off day for a makeup would be Aug.