On the ensuing play, King missed a block and quarterback Matthew Stafford was sacked for a six-yard loss, and the drive eventually stalled, ending with a missed field goal.
Moreno said he took himself out for the play because he didn't feel he was 100 percent, and he had confidence in King.
"It really just comes down to keeping everyone fresh, and maybe I just wasn't as fresh as I wanted to be at that moment, and that's why Caleb went in," Moreno said. "Just because we got the sack doesn't mean it was because I wasn't in. Probably at that point I wasn't 100 percent."
Last week, head coach Mark Richt said Moreno's preseason injuries left him a bit out of shape when the season began, but the sophomore running back said that's not an issue now.
"I don't think anyone's 100 percent, but I'm where I need to be," Moreno said. "I'm where I want to be, I'm feeling good about everything, and I'm still working. I feel good."
Richt said coaches don't force Moreno in or out of games and leave the decision to him to determine how he feels.
"If he's not going to be as effective as the next guy, he's going to let us know," Richt said.