ST. PETERSBURG — A significant setback for starter Tyler Glasnow and knee surgery for infielder Daniel Robertson made for a bad Monday off-day for the Rays.
Also, the team said reliever Diego Castillo was diagnosed with a right shoulder impingement and will miss about two weeks.
Glasnow will be out for at least six more weeks after experiencing discomfort while throwing Sunday that an MRI showed to be forearm inflammation, the Rays said.
He will be shut down from throwing for three weeks then re-evaluated. If all goes well, he could start building back up with the potential for a late August return.
If not, there would be at least the possibility of missing the rest of the season or even be heading toward surgery.
Glasnow had been sidelined since early May with a flexor strain and was aiming to return after the July 8-11 All-Star break. He had been encouraged in throwing his first two bullpen sessions during the team's trip to New York and Oakland.
Until the injury, he had been the Rays best starter with a 6-1, 1.86 record. They have since been using two traditional starters, Blake Snell and Charlie Morton, with Jalen Beeks, Yonny Chirinos and Ryan Yarbrough filling out the rotation, working sometimes behind an opener.
Robertson is also likely to be sidelined into August.
He was sent back to St. Petersburg to have his right knee checked by team orthopedist Dr. Koco Eaton and ended up have arthroscopic surgery Monday to remove a loose body.
Robertson had a rough season thus far, hitting only .202 with a .592 OPS and being sent down to Triple-A June 15 then recalled four days later when Yandy Diaz was hurt.
Castillo should, if all goes well, return right after the All-Star break.
He had been struggling mightily, with a 9.58 ERA over his last 11 outings and more walks (nine) than strikeouts (seven) over infrequent usage, which led to his somewhat surprise placement on the injured list Sunday.
The Rays are also still without Jose Alvarado, who has been gone since June 2 due to family issues and is working his way back into form in Port Charlotte.
Contact Marc Topkin at email@example.com. Follow @TBTimes_Rays.