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7/26/2013 7:07 P.M. ET

Cards to call on Lyons for Tuesday's doubleheader

ATLANTA -- With the flexibility to add an extra player to the roster for next Tuesday's doubleheader, the Cardinals are expected to summon left-hander Tyler Lyons from Triple-A to make a spot start in one of the two games. An official announcement will be made closer to the date.

Lyons has pitched exceptionally well since being sent out of the St. Louis rotation in mid-June. In his six starts following the demotion, Lyons has posted a 1.33 ERA and held opponents to a .118 batting average. He has 37 strikeouts and only eight walks in 40 2/3 innings.

The string of strong starts includes his most recent on Thursday. In Memphis' 5-0 win over Round Rock, Lyons threw seven scoreless innings. Pitching next Tuesday would allow for Lyons to take a normal four days of rest.

"I think we want to go with the guy who is throwing the ball the best," manager Mike Matheny said. "He's been very consistent since we sent him down. He's been as good as anybody could expect him to be."

Inserting Lyons into the rotation for one turn will also allow the Cardinals to send one lefty to the mound during a five-game series against a Pittsburgh team that has a pair of left-handed impact bats in Pedro Alvarez and Garrett Jones.

Holliday set to be activated from DL on Saturday

ATLANTA -- Having passed all the necessary running tests, Matt Holliday is expected to be activated from the 15-day disabled list on Saturday.

Holliday, who strained his hamstring on July 11, has been taking batting practice for more than a week. He was cleared to run at full speed several days ago and likely would have been on the field already had he not had to wait the requisite 15 days for his DL stint to end.

With Holliday on his way back, the Cardinals will have to clear a spot for him on the 25-man roster. That will likely mean sending out extra catcher Rob Johnson or first baseman/outfielder Brock Peterson. With Yadier Molina no longer battling a knee issue, the Cardinals seemingly no longer have a need for the third catcher.

Beltran to host second annual fundraiser

ATLANTA -- Carlos Beltran has announced plans to hold his second annual "Night in Old San Juan" Charity Gala in St. Louis. The event, which will benefit the Carlos Beltran Foundation, has been scheduled for 7:10 p.m. CT at the Four Seasons hotel on Sunday, Aug. 11.

The night will feature food and music from Puerto Rico, as well as a performance from dancer Chelsie Hightower of the television show Dancing With the Stars. Sports memorabilia and vacations will be sold during a live and silent auction. All funds raised will benefit Beltran's foundation, a non-profit organization that helps students pursue academic and athletic achievements.

Among the Cardinals already confirmed to attend the event are Yadier Molina, Matt Carpenter, Adam Wainwright, Allen Craig, David Freese and Edward Mujica. Several other current Cardinals, as well as former players, are also expected to attend.

Individual tickets ($200) and sponsorship opportunities ($2,500-$20,000) are available for purchase. Visit www.carlosbeltranstl.com or call 310-525-3755 for more information.

Hot-hitting Robinson draws another start

ATLANTA -- Shane Robinson drew another starting assignment on Friday, making this the fourth time in the team's last five games that Robinson has been in the lineup. Three of those starts -- including the one on Friday -- have come against left-handed starters.

But when asked if a platoon situation was emerging with Robinson and Jon Jay, manager Mike Matheny cautioned against attaching such a label.

"I wouldn't say that's where we are," Matheny said on Friday. "[We are] recognizing that he's playing very well and when opportunities like today pop up against a lefty, we'd like to keep him going while we can. That gives us freedom when a tough lefty comes around that if we need someone out there… that we're able to make the move pretty easy."

Robinson has earned the chance for increased exposure, having gone 5-for-11 in his three starts since the All-Star break. He entered Friday 7-for-14 in July; Jon Jay is 17-for-62 during that same span.

Worth noting

• Left-hander John Gast underwent left shoulder surgery on Friday during which Dr. Anthony Romeo repaired a muscle in the lat region of Gast's shoulder. Gast has an expected recovery time of 8-12 months, meaning he's expected to still be on a rehab program when Spring Training opens next season.

• According to Matheny, right-hander Chris Carpenter remains engaged in a strength and rehab program back in St. Louis, though the Cardinals are unsure of when Carpenter will be cleared to resume throwing. Carpenter stepped back from his Minor League rehab assignment after experiencing some numbness in his right hand during a start on Saturday.

• Right-hander Carlos Martinez, who was optioned back to Triple-A on Thursday, is scheduled to start for Memphis on Sunday. The Cardinals made the move to send out Martinez so that he would be able to retain his strength as a starter.

• ESPN will pick up the Cardinals' Aug. 5 and Aug. 7 games against the Dodgers for its national telecasts. The first of those two games will start at 6:05 p.m. CT, while the second is scheduled to have a 7:05 p.m. CT first pitch.

Also, MLB Network announced on Friday that it will televise two of the team's upcoming games. The games select include the Cardinals' Aug. 1 game in Pittsburgh (6 p.m. CT) and an Aug. 22 home game against the Braves (7 p.m. CT).

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.