Coach Jeff Fisher said Young was better but did not go full speed with his sore right quadriceps.
"I did say early he's a quick healer," Fisher said of his quarterback. "He's been that way. He can overcome some difficult things rather quickly, so we're very optimistic at this point."
But the Titans still will test Young on Sunday to make sure he can run around and be close to full speed.
"Then we'll make the decision," Fisher said.
Young is 17-11 as the Titans' starter since being drafted with the third pick overall in 2006. He originally hurt his quadriceps muscle in October and missed a game the next week, but has said this injury isn't as severe.
This would be his second game against the Chargers in a month. Young was intercepted twice and limited to 2 yards on two carries. Fisher said Young has studied the tape of that game.
"Hopefully with some anticipation, he'll be able to take advantage of some things," Fisher said.
Running back LenDale White was back with the team after being excused the past two days of practice because of the death of his grandmother. He didn't practice Friday because of a sore knee, but is expected to start after running for 1,110 yards.
Fisher said he visited with White on Thursday and again Friday.
"He's coming around," Fisher said. "He'll get some exercise. His knee is sore. He'll get some exercise, we'll get him stretched out, and we'll have him mentally ready to play."
Center Kevin Mawae missed practice again with his sore left calf, and right guard Benji Olson (back) also sat out. Eugene Amano has started for Mawae the past two games, while Daniel Loper replaced Olson late in last week's win at Indianapolis.
The Titans have a roster spot with receiver Roydell Williams breaking his right ankle, and team officials planned to discuss making a move later Friday. With Mawae and Olson expected to be game-time decisions as well, an offensive lineman was expected to be promoted from the practice squad.
"It's no different than any other position," Fisher said of the injuries in the middle of his offensive line. "We have injuries, younger guys are stepping up. That's what we're dealing with, and so far this year when Danny's gone in to play, he's played well. Same thing with Eugene."
Copyright 2007 by The Associated Press