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8/23/2013 8:10 P.M. ET

Lyons moves into Cards rotation; Martinez to 'pen

ST. LOUIS -- Needing someone to fill the rotation void created by Jake Westbrook moving to the disabled list, the Cardinals have tabbed Tyler Lyons to start against the Reds on Monday.

Lyons shifts back to a starting role after a one-time cameo out of the Cardinals' bullpen. The rookie left-hander pitched two innings of relief on Tuesday, which will allow him to be plenty rested by the time he starts next week. It will be Lyons' eighth start for the Cardinals this season.

"Tyler has had a strong season," manager Mike Matheny said. "I like where he is right now and what he brings to our club. Here is a guy who has been consistent through this season and gives us a good shot. We've seen a couple real nice starts from him, and hopefully we get a few more."

The Cardinals have not committed to keeping Lyons in the rotation for the duration of Westbrook's absence as the veteran deals with a lower back strain, though Matheny noted that it was doubtful that the club would use an off-day next Thursday to skip that spot in the rotation the next time through.

Changing Lyons' role also puts a lefty back in the Cardinals' rotation just as the team prepares to face two division opponents who have been average against lefties this season. The Reds are 22-21 against left-handed starters, compared to 51-34 versus righties. Pittsburgh, despite being 23 games over .500, is 12-12 against lefties. If the Cardinals continue with this five-man rotation, Lyons would face the Pirates in back-to-back starts after Monday.

The Cards are 2-5 in Lyon's seven starts this season. He has posted a 5.35 ERA as a starter, and opponents have hit him at a .257 clip.

With Lyons needed in the rotation, the Cardinals have filled his bullpen spot with rookie Carlos Martinez. Martinez was added to the 25-man roster on Friday, the day he was scheduled to start for Triple-A Memphis. Matheny said that Martinez won't be designated solely as a long reliever, though he is stretched out if needed to pitch multiple innings.

Worth noting

• After playing catch on the field Friday afternoon, closer Edward Mujica, who is dealing with tightness in his upper right back and neck, said he felt "much better." Even still, Mujica said he would not be available to pitch in Friday's game. The Cardinals will reevaluate the right-hander again before determining his status for Saturday.

Matt Carpenter has been named the Cardinals' recipient of the Heart and Hustle Award, an honor that recognizes players "who demonstrate a passion for the game of baseball and best embody the values, spirit and tradition of the game." The award is voted on by committees within the Major League Baseball Players Alumni Association. The overall MLB winner will be announced on Nov. 19.

• Second baseman Kolten Wong made his first career start at Busch Stadium on Friday. Wong struck out in a pinch-hit appearance on Thursday.

• TBS announced that it will televise the Cardinals-Braves game on Sunday. The start time remains 1:15 p.m. CT, and the game will still be broadcast by Fox Sports Midwest.

• With a last at-bat win on Thursday, Triple-A Memphis remains two games behind division-leading Omaha with 11 games remaining on the schedule. The win was Memphis' fourth in a row, but just its second this season when trailing after eight innings.

Jenifer Langosch is a reporter for MLB.com. Read her blog, By Gosh, It's Langosch, and follow her on Twitter @LangoschMLB. This story was not subject to the approval of Major League Baseball or its clubs.