PITTSBURGH (AP) St. Louis Cardinals reserve catcher Brayan Pena will start the season on the disabled list.

Pena is dealing with a left knee injury sustained when he slipped while entering the dugout during an exhibition game. The team placed Pena on the 15-day disabled list on Sunday before the opener against Pittsburgh.

Eric Fryer will serve as the primary backup behind perennial All-Star Yadier Molina.

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Pitchers Jordan Walden (right shoulder strain) and Mitch Harris (right elbow strain), outfielder Jhonny Peralta (left thumb) and infielder Ruben Tejada (left quadriceps strain) joined Pena on the 15-day disabled list. Veteran starter Lance Lynn was put on the 60-day disabled list as he rehabs from right-elbow surgery.

The Cardinals designated pitcher Jayson Aquino for assignment and added outfielder Jeremy Hazelbacker to the 40-man roster.