Injured starter Jaime Garcia was removed from the St. Louis Cardinals' National League Division Series roster Tuesday and was replaced by rookie Shelby Miller.

Garcia exited Game 2 of the series against the Washington Nationals on Monday after pitching just two innings.

An MRI taken during the game revealed Garcia has a rotator cuff strain and inflammation. Garcia was expected to get a second opinion Tuesday.

Garcia experienced shoulder discomfort before the start Monday, but he dismissed it as regular stiffness. When the pain didn't go away, Garcia told the Cardinals about the issue.

Cardinals manager Mike Matheny said Miller, 22, is ready for postseason pressure. Miller was 1-0 with a 1.32 ERA in six games, including one start in the regular-season finale.

"With Shelby, I think we've seen enough of him to be excited about the opportunity for him to get on the mound," Matheny said. "I'm not all that concerned. I think a lot of it has to do with the pressure we put on these guys down the stretch. Every game, to us, was playoff-style intensity. It seemed like every game, everything was on the line."

Miller is one of three rookies on the Cardinals' postseason pitching staff. The others are Trevor Rosenthal and Joe Kelly.

Garcia will not be eligible to return to the active list unless the Cardinals reach the World Series. Even if they advance that far, Garcia's injury could preclude his return to the roster.

Garcia threw 51 pitches Monday, allowing one run on two hits. He also walked three and struck out three.

Lance Lynn is the No. 1 candidate to replace Garcia in the rotation. The Cardinals would not need Lynn to make a start until the NL Championship Series.

Contact reporter David Wilhelm at dwilhelm@bnd.com or 239-2665.