The Cardinals have placed righty Luke Gregerson on the 10-day DL with a right shoulder impingement, the team announced. He’ll be replaced on the active roster by John Brebbia.

Meanwhile, starter Carlos Martinez — who has been on the shelf since May 10th — is headed for an MRI to further assess the injury, Derrick Goold of the St. Louis Post-Dispatch tweets. Martinez won’t return when he’s eligible to be activated, then, but we likely won’t learn more about his anticipated timeline until his imaging is read.

It’s not clear just how concerning the shoulder condition is. That broad description has resulted in brief DL stints or much more significant problems, so it’s hard to make much of it without more information. Notably, though, MLB.com’s Joe Trezza adds on Twitter that Gregerson has also dealt with some elbow soreness, adding to the universe of concerns.

The 34-year-old Gregerson has had some stumbles to start his tenure in St. Louis. Since returning from a hamstring injury, he has thrown only 8 1/3 innings in a dozen appearances, allowing eight earned runs on eight hits (two for home runs) and three walks. He has recorded a typically useful tally of eight strikeouts and 14 groundballs, however, and despite a bit of velocity loss is still maintaining a strong 16.7% swinging-strike rate.

All told, then, it still seems there’s reason for optimism regarding Gregerson’s ability to contribute this year — so long as he’s able to get back to full health. The Cards owe him $11MM over a two-year term, including a buyout on an option for 2020. While there’s still quite a lot of pitching talent at and near the MLB level for the St. Louis organization, the team is stretched a bit with Gregerson joining Martinez and Adam Wainwright on ice. Fortunately, high-octane youngster Alex Reyes is not only nearing a return from Tommy John surgery, but has opened eyes with his early rehab showing.