Cardinals manager Oliver Marmol said Sunday that Matz will require another pain-killing injection for the protruding disc in his lower back and won't resume throwing for at least another week, John Denton of MLB.com reports.

Matz (back) played catch off the mound Friday in St. Louis, John Denton of MLB.com reports.

Cardinals manager Oliver Marmol said Friday that an MRI showed that Matz (back) has a "protruding disc" in his lower back, John Denton of MLB.com reports.

The Cardinals placed Matz on the 15-day injured list Friday, retroactive to May 1, with a lower-back strain.

Matz will undergo an MRI on his injured back Thursday, Katie Woo of The Athletic reports.

Matz pitched through a lower-back injury during Tuesday's loss to the Tigers, Derrick Goold of the St. Louis Post-Dispatch reports.

Matz and the Cardinals will not play Monday after their contest against the Tigers was postponed due to inclement weather, Cody Stavenhagen of The Athletic reports.

Matz took the loss against Oakland on Wednesday, allowing five runs on seven hits and three walks over five innings while striking out four.

Cardinals manager Oliver Marmol said recently that Matz will not be as stretched out as the team's other starters at the beginning of the season, Lynn Worthy of the St. Louis Post-Dispatch reports.

Matz (lat) threw a bullpen session Wednesday, the first day for pitchers and catchers at Cardinals camp, John Denton of MLB.com reports.