OAKLAND -- It has been a week to forget for A¡¯s pitchers.

Originally scheduled to throw a rehab outing on Tuesday, Sean Manaea instead has been shut down from throwing after feeling soreness on his right side. The tough news comes after the A¡¯s lost top starter Frankie Montas to an 80-game suspension on Friday and closer Blake Treinen to the 10-day injured list with a rotator cuff strain on Saturday.

Manaea described the issue as ¡°just a little tightness¡± and does not consider it to be serious, but the A¡¯s do not have a specific timetable for when he might get back on a mound. He last threw 60 pitches in a simulated game at the team¡¯s Minor League complex in Arizona on Thursday.

¡°He¡¯s got a little bit of a side soreness, so we¡¯re shutting him down for a little bit,¡± A¡¯s manager Bob Melvin said Sunday. ¡°I don¡¯t know if it¡¯s an oblique or if he¡¯s just feeling it a little bit in his side. We¡¯re cutting back on him for a little bit here to get healthy. It¡¯s not the arm, which is good.¡±

Out since his September surgery to repair a torn labrum in his left shoulder, Manaea was targeting a return to the Majors just after the MLB All-Star break. It¡¯s unclear at this point if this setback changes that estimation.

Schlitter arrives

The A¡¯s recalled right-hander Brian Schlitter from Triple-A Las Vegas to take Treinen¡¯s spot on the active roster.

In 27 games with Las Vegas, Schlitter went 4-1 with 10 saves and a 3.89 ERA. His 10 saves are tied for second in the Pacific Coast League.

¡°He¡¯s got a good sinker and is pretty good on right-handers,¡± Melvin said. ¡°He threw 40 pitches the other day, so he gives us some length. I don¡¯t know that he has a set role; it will be more of a day-to-day proposition.¡±

If Schlitter does appear in a game for Oakland, it will be his first Major League game since June 14, 2015, with the Cubs.

¡°I just kept doing what I¡¯ve been doing my whole life,¡± Schlitter said. ¡°It¡¯s reassuring and still means something that people are able to give me this opportunity to get back here.¡±