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9/18/2013 7:13 P.M. ET

Scutaro sits after MRI reveals inflammation in finger

NEW YORK -- Giants second baseman Marco Scutaro will likely continue to rest his injured left ring finger until at least Friday, when manager Bruce Bochy said his condition will be re-evaluated.

Scutaro hasn't played since he left Sunday's game at Los Angeles with lower back tightness. Though Scutaro's back continues to bother him, Bochy said "the finger is the issue right now."

An MRI exam Tuesday revealed inflamation in the finger, Bochy said. Scutaro also injured his left pinkie when it was hit by a pitch from Pittsburgh's Tony Watson on June 11.

In another injury-related matter, Bochy said right-hander Sandy Rosario, who injured his right hip trying to pitch in Tuesday's ninth inning, will be sidelined for at least a couple of days.

"Hopefully we'll get him on the mound before the season's over," Bochy said.

Affeldt likely done for season after brief return from DL

NEW YORK -- Left-hander Jeremy Affeldt's left groin injury has lingered enough to sideline him for possibly the rest of the season, Giants manager Bruce Bochy said Wednesday.

Affeldt, 34, has pitched just once since being activated from the disabled list last Thursday. He worked one-third of an inning that night at Los Angeles, allowed one run and two hits, and received the decision in the Giants' 3-2, 10-inning loss.

"I don't know if he'll pitch again. He has to be 100 percent," Bochy said, noting the soreness Affeldt experienced after facing only three hitters was ominous.

Affeldt's health underscored the larger issue that has marred the Giants' season: the likely negative influence of the World Baseball Classic. Of San Francisco's seven Major Leaguers who played in the Classic, five -- Affeldt, third baseman Pablo Sandoval, center fielder Angel Pagan and right-handers Ryan Vogelsong and Santiago Casilla -- spent time on the disabled list this season. And though second baseman Marco Scutaro avoided going on the DL, he has endured back problems since Spring Training.

Right-hander Sergio Romo was the lone Giant among the team's Classic participants to remain healthy this year.

"I don't know if it was bad luck on our part, but something happened to everybody who participated in the WBC," Bochy said.

Affeldt, who signed a three-year, $18 million contract last offseason, is 1-5 with a 3.74 ERA in 39 appearances. His ERA is more than a run higher than the 2.70 figure he posted last year. His ratio of strikeouts to walks dwindled from 2.48 last year to 1.24 this season, he averaged 5.6 strikeouts per nine innings compared to 8.1 a year ago, and his average of 4.5 walks per nine innings rose from last year's 3.3.

Chris Haft is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.