PHOENIX -- D-backs right-hander Trevor Cahill appears set to rejoin the rotation in Pittsburgh this weekend following a third rehab start for Triple-A Reno on Sunday. The 25-year-old worked seven innings, allowing two runs on five hits and three walks while striking out four. He threw 98 pitches and 55 strikes.
"We'll probably move him in there," manager Kirk Gibson said. "Now we know he's strong, built up and going deeper. He's ready."
Cahill struggled a bit with fatigue and his arm slot in his previous two outing for Reno, tossing a combined 9 2/3 innings and surrendering 10 runs (nine earned).
"It took longer than I thought, but this time I felt good," Cahill said. "Once I was able to get comfortable, I felt like I was fine. I felt stronger as the game went on."
On the disabled list since July 1 with a right hip contusion and later some shoulder soreness, Cahill will step into the rotation for Zeke Spruill, who was optioned Monday after his start Sunday. With the D-backs off Thursday, the right-hander would make his return Saturday against the Pirates if Arizona keeps its starters in turn.
On DL, Ross to undergo season-ending hip surgery
PHOENIX -- A day after Cody Ross dislocated his right hip trying to beat out a grounder at first base, the D-backs placed the 32-year-old outfielder on the 15-day disabled list Monday and announced that he will undergo season-ending surgery Tuesday morning to repair a small fracture caused by the injury.
"It's going to be a while," D-backs manager Kirk Gibson said. "It's a traumatic injury."
With two down and a man on second in the first inning Sunday against the Mets, Ross hit a slow roller to third base and appeared to stumble just before stepping on the bag at first. He immediately fell to the ground, writhing in pain. Ross was lifted by a stretcher onto a medical cart and driven off the field to a local hospital where doctors popped the hip back into place. Ross was transported to a different hospital Monday where the surgery might take place.
Because of the unusualness of the injury, the D-backs don't have a realistic timetable for Ross' return. Gibson said he was hopeful the outfielder would be back in time for Spring Training, but that he didn't know much about the recovery process.
"It's not like a guy who messed up his elbow where you know it'll be 11 months. I think it's a little more complicated than that," Gibson said. "I don't think many people do this in baseball. It's not a common injury."
Gibson added that he texted Ross, who had hit .395 over his last 12 games before the injury, and received only positive-thinking words in response.
"He told me it was a bump in the road, not to worry and that he'll be good," Gibson said. "That's kind of how his attitude is."
Skaggs, Roe called up to aid 'pen; Spruill optioned
PHOENIX -- Needing bullpen help after Arizona relievers worked six innings Sunday, the D-backs recalled Tyler Skaggs and Chaz Roe from Triple-A Reno on Monday. To make room on the roster for the pitchers, Zeke Spruill was optioned to the Minors and Cody Ross was placed on the disabled list.
"We needed protection, that's why we brought them up," D-backs manager Kirk Gibson said. "If we didn't do it and we got into a situation like we did [Sunday], then you really wear those guys out."
Arizonas has nine relievers, two more than teams typically carry.
"It'll be temporary, probably," Gibson said. "I don't like to go short. You're playing National League games, you need more maneuverability."
Skaggs, who came into the season as Arizona's No. 1 prospect, has started seven games for the D-backs, going 2-3 with a 5.35 ERA, but has never appeared in relief.
"It's going to be different, I'll just try to stick to the same routine and not rush," Skaggs said. "I think it'll be fine. It shouldn't be a big deal. I'll warm up like I'm starting and just go out there and do the same that I've been doing."
As for Roe, Monday marked his third callup this season. He has appeared in four games with the D-backs in 2013, allowing three earned runs 4 2/3 innings. He has eight saves and a 1.21 ERA in 23 relief appearances with Double-A Mobile and Reno.
"I'll take any opportunity I can get," Roe said. "It's always a pleasure to come up here and play. The first time I was a little nervous, then the second time I started settling in. Hopefully this time it'll be even better."
Spruill was 0-2 with a 7.71 ERA in two starts for Arizona in August. He took the loss Sunday in a 9-5 defeat to the Mets, allowing five runs (one earned) in just three innings.
Montero, Bloomquist move closer to rehab stints
PHOENIX -- A pair of injured D-backs position players could begin rehab assignments as soon as the end of the week. Both Willie Bloomquist (left hand) and Miguel Montero (lower back) began swinging the bat over the weekend after returning to baseball activities in the field.
On the disabled list since the beginning of August, Montero took batting practice and participated in blocking drills Monday.
"We'll put a plan together and maybe towards the end of the week we can start catching him a little bit," D-backs manager Kirk Gibson said. "My guess is he'd probably catch three innings or so at first and maybe get an at-bat."
Although his manager is trying to take his recovery slow, Montero reiterated Monday his desire to return to the lineup as soon as possible.
"I feel like I'm ready," he said.
As for Bloomquist, his broken hand has finally healed enough for the veteran infielder to handle a bat again. He had been taking grounders for the last week after being sidelined since June 28.
"He's champing at the bit," Gibson said. "He wants to get going. He wants to start playing somewhere."
Tyler Emerick is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.