Matz (back) is traveling with the Cardinals and is expected to be activated from the injured list this weekend, Jeff Jones of the Belleville News-Democrat reports.
If activated as expected, it seems Matz will be added as the extra pitcher when rosters are expanded Sunday. The southpaw completed his sixth rehab start Tuesday with Triple-A Memphis during which he gave up two earned runs on five hits over three innings. It remains to be seen if he will return as a starter or long reliever.