BALTIMORE — Yet another member of the A’s rotation is dealing with an injury, The Chronicle has learned.

Oakland, which has absorbed blow after blow to its group of starters, is looking at losing Trevor Cahill for at least one start this weekend. Cahill, who is scheduled to work Saturday’s game at Tampa Bay, said he is receiving treatment for a rhomboid muscle issue on the right side of his upper back.

“We’re taking it day to day,” Cahill said before the A’s win in Baltimore on Wednesday.

Should Cahill miss Saturday’s start, the team is likely to use its “bullpenning” approach, with Liam Hendriks as the “opener” and a more traditional starter such as Daniel Mengden, Frankie Montas or Chris Bassitt following him. Hendriks pitched the first inning Wednesday night, and Mengden followed with five no-hit innings.

The A’s have lost 10 pitchers (including Cahill twice, for 10 days in May for an elbow impingement and for a month in June/July with an Achilles tendon strain) to 13 different injuries, not counting Cahill’s current issue. Seven are, for all intents and purposes, out for the season, five of them because of injuries requiring surgery.

Cahill, signed as a rotation fill-in in March, is 6-3 with a 3.77 ERA and he’s 5-0 with a 1.49 ERA at the Coliseum. If he responds to treatment as expected, he should not miss his start at home next week, and should he return more quickly than anticipated, there’s a possibility he could make two starts at home next week if Oakland adjusts the rotation.

Better weather: With Hurricane Florence apparently shifting south, forecasts for Thursday are much better than expected, and the game, which the Orioles had discussed starting earlier in the day, is expected to remain at 7:05 p.m. Eastern time.

Brett Anderson will come off the disabled list to start. Manager Bob Melvin said that Anderson will not be on a pitch count, at least not any more than any other A’s starter — with 18 relievers, no starter has worked more than six innings in the past 19 games.

Susan Slusser is a San Francisco Chronicle staff writer.