Silva (10-6, 4.22 ERA) reported the soreness during batting practice on Sunday.
Samardzija (0-1, 18.90 ERA) had been penciled in for next Saturday against the Marlins. He began the season with the Cubs but was sent down to Triple-A Iowa after four outings. In 35 games with Iowa, including 15 starts, he was 11-3 with a 4.37 ERA.
"It sounds good. I'm ready to go and my arm feels good. I'll just get out there and just really attack," said Samardzija, who has not thrown in a game since being called up last Tuesday. "I don't think there's anything to change or anything to look at."
Samardzija made two starts last season with the Cubs among the 20 games in which he appeared, and he gave up 10 earned runs in 8 1/3 innings in those games. He has been looking forward to getting another chance.
"It's definitely been something that's been on my mind for a long time," he said. "They use the term, 'You get hungry,' or whatever, whatever you want to say. When you spend the whole year down there in Triple-A, this is definitely something you look forward to and get excited about, for sure."
Samardzija was watching the NFL games in the clubhouse before and after the game. Does the former All-America wide receiver for Notre Dame ever think about playing football?
"Nope," he said.
As for Silva, he was to return to Chicago to be examined by the team's orthopedic specialist, Dr. Stephen Gryzlo.
In other pitching news, left-hander Tom Gorzelanny had his second bullpen session on Sunday at Miller Park and could be close to returning to the rotation. The only question is when.
With Samardzija now in the mix, the Cubs have a six-man rotation, although that may change depending on Silva's status. Gorzelanny, who has been rehabbing since being hit on the left hand by a line drive on Sept. 1, threw 40 pitches on Sunday.
Manager Mike Quade said that he will meet with pitching coach Larry Rothschild on Monday to discuss their options.