PHILADELPHIA -- Chip Kelly said he wasn’t concerned about the Philadelphia Eagles' safeties, which makes him perhaps the only person in the Philadelphia area who feels that way.

Kelly was talking about the availability of the injured Nate Allen (hamstring) and Earl Wolff (knee), and he clarified his lack of concern by pointing out that it was only Thursday morning. There were three more practices to get through before Sunday’s game in Houston. As Kelly likes to say, who knows if someone else will twist an ankle by then?

In other words, his lack of concern is based more on Kelly’s personal philosophy than on the status of the players.

"I’m not a doctor," Kelly said. "It’s that simple. People waste a lot of time on things they can’t control. I can’t control injuries. For me to weigh in on it, it’s ludicrous. What position can I take? 'Dr. (Peter) DeLuca, I see it this way.' Just tell us who can go. I’m not Dr. Miyagi. I can’t put my hands together and touch his leg and make it better."

(Actually, Mr. Miyagi, from "The Karate Kid", was not a doctor, either, but that’s another story.)

One positive development: Allen, who missed practice on Wednesday, was on the field with a helmet on during the beginning of Thursday’s session. Wolff was dressed and ready to go. Nickel cornerback Brandon Boykin, who also missed Wednesday’s drills with a hamstring injury, wore his helmet on Thursday.

If Allen can’t play, Kelly said several players could fill in. Wolff, who lost the training camp competition for the job, would be one. Chris Maragos, who excels on special team, is another. Rookie Jaylen Watkins, who hasn’t played much this season, is the third.

"It depends on how we go through training and what package Billy (Davis, the defensive coordinator) is in," Kelly said. "There’s a lot of different variables."

On Wednesday, Kelly was less than enthusiastic when asked how Wolff was playing.

"Earl’s been OK," Kelly said. "I think he needs to be a little bit more consistent from that standpoint, but he's OK."

Asked about that Thursday, Kelly elaborated.

"Everybody does," Kelly said. "That’s not a slight on Earl. There’s no one, right now, that I can say, 'They’ve got it, go take it in, don’t practice today.' He needs to be more consistent in terms of practice, and I think he’d be the first to tell you that."

Said Wolff: "I’m just waiting on my shot. I may play this week. At the end of the day, I’m preparing for every game like I’m going to play. So it’s not like I’m doing anything different. I’m going to be ready if my name’s called."