CINCINNATI -- With Jason LaRue's status in doubt, the Cardinals made a move on Wednesday, purchasing the contract of catcher Steven Hill from Double-A Springfield. To make room on the active roster for Hill, the Cardinals placed pitcher Jeff Suppan on the 15-day disabled list with a strained right groin.

The club believes that LaRue has a slight concussion following his involvement in Tuesday night's scuffle between the Cardinals and Reds.

"I do have a concussion, a slight concussion," LaRue said. "We'll see how we progress tomorrow and the next day."

LaRue also has several lacerations on his body and face and some soreness in his ribs.

"They're testing him for a concussion, and they're going to X-ray his ribs tomorrow," manager Tony La Russa said. "He's got a lot of soreness from where he was kicked in his ribs, plus all the cuts. They felt last night he had a concussion, so we'll be real careful with him."

Hill was chosen, rather than Triple-A catcher Bryan Anderson, in large part for logistical reasons. The Cardinals' Triple-A Memphis affiliate played a night game in Reno, Nev., on Tuesday, so it was not possible to get a player to Cincinnati in time for Wednesday's early start.

"It's a roller coaster," Hill said. "It's every kid's dream come true. This is where everybody works to be at, and I'm blessed to be here."

Suppan suffered a groin strain on Monday when he was running, a day after his scheduled start against the Marlins was rained out. The move is backdated to Aug. 1, so technically he could be reinstated to the roster within a week if he recovers quickly.

Hill's addition puts the Cardinals at 40 players on their 40-man roster.

Lohse may get chance to start Sunday

CINCINNATI -- Kyle Lohse stated his case emphatically on Tuesday night. He may not have to wait long for his reward.

Lohse turned in seven outstanding innings for Triple-A Memphis on Tuesday in his fourth Minor League rehabilitation start. He struck out nine against two walks, allowing one run on three hits. Lohse is recuperating from forearm surgery in May.

Five days after Tuesday would put Lohse on turn to start Sunday at home against the Cubs, and manager Tony La Russa said that that is a possibility. It would also be rookie Jaime Garcia's fifth day, but with Garcia scuffling a bit lately, the Cardinals may choose to give him extra days of rest or even skip him entirely.

"We haven't had a chance to talk about it," La Russa said on Wednesday morning. "But I know Lohse had a really good game yesterday. We really haven't talked about it. The game yesterday was overwhelming, and today, we're trying to get ready for this one. ... Garcia pitched yesterday. [Lohse] pitched yesterday. There's some flexibility there, so we wanted to get all the information."

La Russa did confirm that Chris Carpenter will start Saturday's home game against Chicago, leaving only Sunday's starter undecided for the weekend series.

Worth noting

Manager Tony La Russa said that he checked with Skip Schumaker prior to Wednesday's game and that Schumaker checked out fine. Schumaker was removed from Tuesday night's game because of cramping in his legs, but he was in Wednesday's starting lineup. ... Since being sent to Triple-A Memphis last week, Nick Stavinoha has at least one hit in every game and is 16-for-33 in seven games. Stavinoha has six extra-base hits in those games, giving him an .848 slugging percentage. ... When the Cardinals beat the Reds on Tuesday night, it marked Cincinnati's first series loss since the All-Star break.