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7/27/2014 2:08 A.M. ET

Cain's lingering pain casts uncertainty on return

SAN FRANCISCO -- The good news for the Giants is that they acquired Jake Peavy, the pitcher who was recommended they trade for as a No. 4 starter by eight scouts who watched him in eight different games this season.

The bad news is why the club felt the need to accelerate pulling the trigger on the trade with the Red Sox: the elbow inflammation that landed Matt Cain on the 15-day disabled list earlier this week hasn't improved during his rehab regiment, and when he'll return -- if he returns -- is up in the air.

"We really felt he's going to be out for a while no matter what and we didn't want to stay as constituted," general manager Brian Sabean told the media on Saturday afternoon. "We were fortunate in the timing. Everybody knows that we're not in a good [standing] roster-wise, especially this series missing [Brandon] Belt, [Angel] Pagan and Cain.

"The longer [Cain] goes in this dormant stage, the more we're probably going to have to seek second opinions and more diagnostics, thus the timeline gets stretched out. There may be a worst case. We haven't gotten to that point yet."

The odds, though, are growing that Cain's 2014 season could end early.

Cain, the longest-tenured Giant, is 2-7 with a 4.18 ERA in 15 starts this season.

Giants send down Kontos to clear spot for Peavy

SAN FRANCISCO -- The acquisition of Jake Peavy for a pair of Triple-A pitchers spelled trouble for one player who woke up Saturday a member of the Giants' 25-man roster.

After the team's 5-0 loss to the Dodgers on Saturday night, it was announced that player was reliever George Kontos, who was sent back to Triple-A Fresno.

Kontos' latest stint with the Giants was as successful as it was brief. In three appearances since being promoted early last week, the Chicago-area native allowed two earned runs on five hits in 6 1/3 innings. He recorded the win in two of the Giants' three wins against the Phillies.

He owns a 3.00 ERA in 21 innings with the Giants this season.

No. 3 prospect Susac called as Sanchez hits DL

SAN FRANCISCO -- Friday was a roller-coaster day for road roomies Nick Noonan and Andrew Susac. Shortly after sunrise in El Paso, where Triple-A Fresno was in town to play the Padres' affiliate, Noonan was designated for assignment to create room on the Giants' 40-man roster. After sundown, Susac got a call from assistant general manager Bobby Evans. He'd been called up to the Majors for the first time.

"Lot of emotions in that room yesterday," a stoked Susac said inside the Giants' clubhouse on Saturday.

Susac, ranked by MLB.com as the Giants' No. 3 prospect, is hitting .268/.379/.451 with 10 home runs and 32 RBIs in 63 games with Fresno this season. He was promoted after catcher Hector Sanchez was placed on the seven-day concussion disabled list on Saturday; a foul tip to the mask forced him to leave the Giants' 8-1 loss to the Dodgers on Friday night. Manager Bruce Bochy said Saturday he anticipates Sanchez needing a few more than just seven days to fully recover.

Coincidentally, Susac's season was derailed for a couple of weeks by a similar foul tip. He said he had trouble initially passing concussion tests, and when he returned 13 days later he pulled a hamstring.

"I had some brutal luck," Susac said. "Two days ago, I got hit in the hand. I've had a target on my back as far as injuries, but I'm healthy, I'm 100 percent. Hopefully it stays that way."

A Roseville native, Susac grew up as a Giants fan. He attended games at both Candlestick and AT&T Park, so his first trip to the ballpark as a player was extra special.

"It's pretty cool, man," Susac said. "I kind of just stepped back and looked at it all when I got here … It was an awesome feeling."

He's not a complete stranger in his new surroundings, which he said should help accelerate his assimilation. He's played with the pros in Spring Training and progressed through the organization at a nearly identical pace to fellow recent callups Adam Duvall and Joe Panik, who was his Triple-A roommate before a June promotion.

"Just the fact that they know my name is an easy thing," Susac said. "I don't have to introduce myself over and over."

Bochy plans for Susac to start once a week.

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