Clark is nursing a quad his quad, while Haynes missed a second straight day of practice because of a sprained ankle. Neither is expected to be out long-term.
"I'm assuming they'll be back Monday," said team trainer, Tim Bream.
After missing three days with back spasms Anthony Thomas practiced for a second straight day.
"It's always a concern, but his back has spasmed before, but it's never been a chronic problem," said head coach Dick Jauron. "He said it was a little tight, but he's practiced two days in a row. Hopefully it will be over and it won't be a topic anymore. He didn't say anything to me today about it."
Although Adrian Peterson worked with the first team offense, it doesn't mean there is a running back controversy.
"We need to see a lot of both of them (Peterson and Thomas)," said Jauron. "Both very young running backs. A lot of times when you're fairly sure of your number ones you want to get the young players that you think has potential against a top-line player, just so you see how it stacks up."
During seven-on-seven drills Rex Grossman pleased the crowd completing three straight passes to Ahmad Merritt, Bobby Wade and Justin Gage. The quarterback also hooked up with Jamin Elliot, who made a great diving catch over the middle.
Even with a week before their first preseason game, the team is getting anxious to hit somebody that isn't in the same uniform.
"They'll be looking forward to it; I'm sure they are already," Jauron said. "(There is) still a lot of work to do and (it's) still early in camp."
The Bears have Sunday off before getting back on the field Monday for two practices beginning at 8:30 a.m. and 2:30 p.m.