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9/1/2013 8:36 P.M. ET

Andrus sits with stiff lower back

ARLINGTON -- Elvis Andrus said his lower back was stiff Sunday, but he hopes to play sometime in the upcoming A's series.

He left Saturday's game in the first inning with back spasms while running from first to third. Andrus slowed down halfway to third base and left the game after the play. He said he tweaked his back on Friday, but it got worse after he ran the bases. Andrus has dealt with back issues throughout the season, but mostly in his upper back.

"I'm going to rush it as much as I can, but I want to be healthy out there," Andrus said. "I haven't been 100 percent since the second game of the season. At least 80 percent would work."

Andrus said he feels the injury when he reaches down, but not when he's hitting. He got Sunday off, but Rangers manager Ron Washington said he planned to give Andrus a day off even before the injury.

"We're not worried about the importance of the series [against the A's], we're worried about the importance of the players that we have to play in that series," Washington said. "If Elvis is not ready to play, Elvis is not ready to play. We're not going to dig a hole and hide. We have missed a lot of players, and we continue to move forward. It's not going to change."

Andrus hit .303 with 11 steals, 18 runs and 20 RBIs in August to become the first player in franchise history to reach those numbers in a month in those three categories. Mike Trout was the only player to produce such stats since the start of last season.

Adduci makes long-awaited big league debut

ARLINGTON -- After 10 years and 889 games in the Minors, Jim Adduci finally got his chance. The outfielder made his Major League debut Sunday against the Twins in left field, and Adduci didn't waste any time collecting his first Major League hit.

He swung on the first pitch from Kevin Correia and hit a grounder up the middle of the infield for a single with two outs in the second.

"A couple of the guys I've talked to said you only see one first pitch," Adduci said. "I was just looking in the zone and was able to put it in play and get a hit."

The outfielder finished 1-for-2 with a walk before Craig Gentry pinch-hit for Adduci in the ninth. Adduci hit sixth for the Rangers, who purchased his contract from Triple-A Round Rock on Sunday.

"That was a really special moment for me," Adduci said. "I waited a long time for that. For that moment right there, that was something I'll never forget.

Adduci, 28, has hit .298 with 16 home runs and 65 RBIs for Round Rock this season. He played well in August, batting .383 with a .465 on-base percentage. Adduci is 17-of-41 with two home runs and eight RBIs in his last 10 games.

"I just wanted to get him in there right away," Rangers manager Ron Washington said. "With [David] Murphy struggling a little bit and him swinging the bat well, I just wanted to take advantage of it and get him in early. We certainly will need what he has to offer."

Adduci has stolen 32 bases this season and can play all three positions in the outfield. He signed a Minor League deal with the Rangers last offseason after spending nine years in the Marlins and Cubs farm organizations.

"You just don't know what's going to happen in this game," Adduci said. "It could be injuries or anything like that. You just keep moving forward and give effort."

His called wife and his father, Jim, once he heard the Rangers purchased his contract. His father spent four seasons in the Majors as an outfielder and first baseman for the Cardinals, Brewers and Phillies.

"It's just the belief when you were a kid, and you just want to accomplish the goal. When you set your sights on something, sometimes there's things that don't go your way and you've got to keep pushing," Adduci said.

Adduci was born in British Columbia but attended high school in the Chicago-area, and he became just the fourth Canadian-born position player to appear for the Rangers.

Rangers add seven as rosters expand

ARLINGTON -- The Rangers activated seven players Sunday as rosters expanded, and they plan to bring more players later on in the final month of the season.

Lance Berkman and Nick Tepesch were reinstated from the 15-day disabled list, Michael Kirkman and Neftali Feliz returned from the 60-day disabled list, Cory Burns and Robinson Chirinos were recalled from Triple-A Round Rock and Jim Adduci's contract was purchased from Triple-A Round Rock.

To make room on their 40-man roster, the Rangers designated Joe Benson for assignment and unconditionally released Justin Miller.

Rangers manager Ron Washington said before Sunday's game that he would use Berkman in a pinch-hit situation against the Twins. He's been on the disabled list since July 7 with left hip inflammation. Tepesch will start out of the bullpen after recovering from right elbow inflammation, and he is a possible starter, though he didn't throw more than 59 pitches in a rehab start.

"You've got to be ready to pitch when you're called upon," Tepesch said of his bullpen role. "It's a little like having a plan set out when you're going to pitch every day."

Feliz recovered from Tommy John surgery on his right elbow on Aug. 1, 2012. He threw 10 2/3 scoreless innings over eight rehab outings in the Arizona Rookie League and Round Rock. Kirkman returned as he dealt with a form of skin cancer during the season. He was placed on the disabled list on June 7 with a recurrence of cutaneous lymphoma. Kirkman went 2-3 with a 6.98 ERA over six games (five starts) with Round Rock on his rehab assignment.

Washington said the team plans to add more players soon. Ross Wolf is likely to return after he was optioned to Round Rock before the series against the Twins to make room for Joseph Ortiz. Engel Beltre could be another possible option for Texas.

Worth noting

Adrian Beltre, the American League Player of the Month for July, hit .381 with five home runs and 21 RBIs in August. It's Beltre's highest batting average in his career for any month.

• Joey Gallo has 40 home runs with Class A Hickory, one shy of tying the Rangers' farm record. He's the first teenager with 40 or more home runs since Dick Simpson in 1962.

• The Rangers have scored two runs in four of their last seven games. They're 3-6 in the last nine games when scoring fewer than two runs after they started the season 3-33.

Master Tesfatsion is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.