ARLINGTON -- Brendan Ryan, whom the Mariners expected back in the lineup during Seattle's series in Texas, was instead placed on the 15-day disabled list on Monday, retroactive to Thursday, because of a sore left shoulder.

"He had it looked at today, so we're going to have to put him on the DL," Mariners manager Eric Wedge said before the game.

With Ryan on the DL, the team called up infielder Luis Rodriguez from Triple-A Tacoma to replace him on the 25-man roster. The 30-year-old Rodriguez is expected to arrive from Round Rock, where the Tacoma Rainiers were playing, for Monday night's game.

Wedge admitted that he thought there was a chance Ryan's injury could have been much worse once it became clear that a few days off would not do the job.

"We were afraid that something might have been torn in there, but it's not; it's more of a separation," Wedge said. "You're looking 10 days to two weeks. Let him calm down and get some treatment on it. He dodged a bullet. He landed on it pretty good, and obviously, he's pretty sore for the last couple days. We want to get it looked at again."

Ryan, who stayed in Los Angeles to get treatment with a doctor there, is eligible to come off the DL on Aug. 19.

"We didn't want to put him on the DL until it was absolutely necessary, and that's what we've done," Wedge said. "We should be looking activity sometime this weekend or over the next week hopefully."

Smoak hopes to be ready by Tuesday

ARLINGTON -- Mariners first baseman Justin Smoak was not in the lineup again on Monday, as he swung a bat for the first time since he began resting his jammed left thumb on Thursday.

"Smoak took some swings today and felt a little bit better," Mariners manager Eric Wedge said. "We're moving forward with him. Today, it was from the left side of the plate."

Smoak said he probably would not be available to pinch-hit Monday, but he could be ready as early as Tuesday.

"I did hitting today for the first time," Smoak said. "Hopefully, I'll be ready tomorrow. That's the plan, so we'll see what happens."

Wilson to get opportunities in place of Ryan

ARLINGTON -- With everyday shortstop Brendan Ryan on the disabled list, Jack Wilson was in Monday's lineup batting second and playing shortstop.

Mariners manager Eric Wedge said that Wilson would be the primary backup for the team in Ryan's absence.

"Play Jack mostly, and [Luis Rodriguez] can play some shortstop for us," Wedge said. "[Kyle] Seagar can play a little bit of shortstop, but Jack will get the majority."

Rodriguez, who was called up to replace Ryan on the roster Monday, has started 10 games for the Mariners at shortstop this season and will also get a look.

The most unlikely candidate is Seager. The rookie has started the past two games for the Mariners at third base and has not played shortstop in the Major Leagues.

"He played there a little bit in Triple-A," Wedge said. "Probably not as much now that we've got Louie in here."

Mariners dealing with the Texas heat

ARLINGTON -- Any trip into the Texas heat requires the opposing teams to make adjustments, but the Mariners might have the toughest one of all.

The game-time temperature for each of the Rangers' past four games has been more than 102 degrees. Saturday's game was a Rangers Ballpark in Arlington record, 106 degrees for a 7:05 p.m. CT game against the Indians. Monday's temperature was announced at 104.

"We're going to make sure we keep them hydrated, keep them in and out," Mariners manager Eric Wedge said. "Just keep a close eye on them. Tomorrow, we'll probably just hit in the cages, keep them off the field a little bit."

For Irving, Texas, native Blake Beavan, the heat is almost preferable.

"It's fun to play in," Beavan said. "You don't really have to worry about being loose or warming up for 30 minutes beforehand. If you aren't playing sports, I guess it's kind of rough, but you get used to it."

Worth noting

• Blake Beavan's six consecutive quality starts to begin his career is a club record, breaking the old mark of five set by his rotation-mate Michael Pineda.

• When the Mariners started five rookies for Sunday's 2-1 loss to the Angels, it was the first time the team started five position-player rookies in a lineup before the September roster expansion since Aug. 18, 1993, against the Orioles.

• Mike Carp is batting .368 with four doubles, a triple and three home runs since being recalled from Triple-A Tacoma.