The depth of the division leading St. Louis Cardinals continues to be challenged as they were dealt another injury to an integral part of their offense.

Outfielder Matt Holliday was placed on the 15-day DL on Tuesday after an MRI revealed a Grade 2 tear of the quadriceps.

"We'll take those 15 days and re-evaluate because we don't know how it's going to heal in that time," manager Mike Matheny told reporters. "Right now I feel like we're pretty well covered in the outfield with the four guys we're trying to get time for anyhow."

While chasing down a pop up in shallow left field, Holliday caught his cleat in the grass and fell to the ground, grabbing his right leg in pain. He was able to walk off the field under his own power but immediately exited to the clubhouse.

"We were glad it wasn't worse," GM John Mozeliak said.

The 35-year-old had been off to an excellent start this season, hitting .303/.417/.421 with three home runs, 10 doubles, and 26 RBIs.

St. Louis is already without Matt Adams as the first baseman resides on the 60-day DL with a torn quad.

"With Matt Adams, his was higher up the leg and you'll also recall that it was torn completely," Mozeliak said. "[Holliday's] is not a complete tear at all. It's much milder than that. It's really something that can heal [without surgery]."