Cardinals manager Oliver Marmol said Thursday that Maton is "fully built up" after working out the last several weeks in Arizona, John Denton of MLB.com reports.
Maton was signed to a one-year contract Thursday, just two weeks before Opening Day. However, it sounds like he'll be ready to roll for the Cardinals' March 27 opener against the Twins. Maton will throw a live batting practice session Sunday and should see game action shortly after that. He is projected for a setup role in St. Louis.