Giles gingerly walked through the clubhouse and was scheduled to be examined by a Phillies physician.
"We need to get the swelling out of there," Giles said of his knee.
Giles suffered the injuries Friday when Phillies catcher Carlos Ruiz attempted to break up a double play with a hard slide into second in the fourth inning of the Padres' 14-3 win. Second-base umpire Bill Welke ruled it a double play, with interference on Ruiz. But the ruling was tempered by Giles being forced to leave the game.
"It's not that hard of a play to slide," Giles said. "He had plenty of time to take me out. There's no excuse for it, really."
Giles had been 4-for-7 on the team's road trip before the incident at second base.
"It's unfortunate," Padres manager Bud Black said. "It's one thing if a guy slides. But it wasn't even a slide. It wasn't anything close to a slide."
Stauffer on Sunday: Black officially named Tim Stauffer as the starting pitcher for Sunday's finale in Philadelphia.
It will be Stauffer's second start and his first since a forgettable effort on July 29 at Houston. In that game, the Padres jumped out to an 11-0 lead and wound up winning, 18-11. However, Stauffer lasted just 3 2/3 innings and gave up four hits, including three home runs, and seven earned runs.
Black did see plenty of positives in Stauffer's initial start.
"I thought his fastball had very good velocity," Black said. "His slider was sharp. He sort of hit the wall in the fourth."
Stauffer, who is expected to join the Padres on Sunday, is 8-4 with a 4.40 ERA at Triple-A Portland.
Hot hitter: Catcher Josh Bard is in quite a groove on the road trip. Entering Saturday's game, he was 10-for-18 with four doubles, five RBIs and three runs, including 8-for-10 over the past two games.
Bard was 5-for-6 in Friday's victory.
"Being able to get an opportunity to play has been a big deal," Bard said.
Black also pointed to another factor.
"He's seeing the ball well," Black said. "From what I see, he's not expanding the strike zone and he's not swinging at balls. He's swinging at strikes and taking walks."
Fortysomethings: Greg Maddux and Jamie Moyer were both drafted by the Cubs in 1984. But they had never faced each other in a Major League game until Friday, when the 41-year-old Maddux outdueled the 44-year-old Moyer.
Maddux won his 343rd career game, placing him ninth all-time. It was also his 20th consecutive season with at least 10 wins, breaking the previous record of 19 held by Cy Young from 1891-1909.
"It means we've both been around for a while," Maddux said of himself and Moyer.
The pair have a combined 570 career victories.
Injury updates: Black said that pitcher Chris Young (lower back) continues to make progress while recuperating in San Diego.
"He played catch today," Black said. "He is taking it cautiously. We'll wait a day or two when we get back to San Diego."
Young felt tightness in his back after Tuesday's start.
Meanwhile, outfielder Scott Hairston is not ready to play since suffering a strained left oblique muscle on Aug. 10, when he was placed on the 15-day disabled list.
"He's coming around, but not at a pace that can get him back on the roster anytime soon," Black said.
Coming up: Stauffer (0-0, 17.18 ERA) will get the start for San Diego in the series finale at 10:35 a.m. PT. Rookie right-hander Kyle Kendrick (6-3, 4.06 ERA) will get the nod for Philadelphia.