Just Monday, Opening Day starter Kendall Graveman, subjected to an April demotion, had the procedure. Jharel Cotton went through the motions in March, prospect A.J. Puk in April.
"We've been hit hard with that this year, starting in Spring Training with Puk and Cotton," A's manager Bob Melvin said. "Obviously it's unfortunate. These are injuries that keep you out for a while. You always talk about depth and the rotation and trying to create as much depth as you can. To have this many guys go down and be out as long as they can certainly hurts us, but it gives someone else an opportunity."
Gossett, who has been on the disabled list since June 4, had a 5.18 ERA in five starts for the A's this year. He posted a 6.11 ERA in 18 outings as a rookie in 2017.
"I know he's a hard-working kid, he's come a long way," Melvin said. "We saw some really good games from him this year, and I believe he'll rehab this thing and be back strong as ever, but unfortunately it's just going to take a while."
Luzardo making moves The A's plan to promote No. 1 prospect Jesus Luzardo to Triple-A Nashville for his next start. Luzardo, who began the season at Class A Advanced Stockton, completed his Double-A tour with five innings of one-run ball Tuesday, exiting with a 2.29 ERA.
He struck out 86 in 78 2/3 innings over 16 starts.
"He's pitched great at Double-A and will have the challenge of Triple-A the last month of the season," A's general manager David Forst said.
Forst deemed it unlikely Luzardo would join the big league club by year's end but didn't rule it out. Luzardo, who will celebrate his 21st birthday in September, has thrown 93 1/3 innings this season and isn't expected to go more than 125.
He's less than three years removed from Tommy John surgery.
"It's not something we discussed," Forst said. "I don't rule anything out, but I don't expect him to be here. I'm not going to get into our thinking. I don't think it's the best thing for him or for the team right now. That might change on Sept. 1."
"It's a terrific talent," Melvin said. "We've limited his innings, his pitches, in order to potentially have him next year. I don't see him with us this year. I just don't know that you push somebody like that that's a year off of Tommy John that looks to be a big part of our future. It's just probably not worth the risk."