PHILADELPHIA -- Quarterback Kevin Kolb and linebacker Stewart Bradley have not been ruled out for Philadelphia's game at Detroit next Sunday despite sustaining concussions in the season opener.

Eagles coach Andy Reid says both players must pass a specific evaluation process before they are cleared to play. He says the team's medical staff will follow the NFL's guidelines for concussions.

Bradley sustained a concussion when he collided with Ernie Sims during Philadelphia's 27-20 loss to Green Bay on Sunday. Yet somehow, the Eagles' middle linebacker returned for a few plays before he was pulled for the rest of the game.

Minutes before Bradley went down, Kolb's head was slammed down so hard on a tackle from behind that a chunk of grass got stuck in his helmet. He got up slowly and walked off the field.

The team initially said Kolb had a jaw injury, and the quarterback returned to throw three passes before sitting out the rest of the game with a concussion.

Head injuries were an important issue for the NFL in the offseason. Last year, the league implemented stricter return-to-play guidelines for players who show concussion symptoms, and each team must consult with an independent neurologist whenever there is a head injury.

Kolb and Bradley weren't available for comment Monday. Both players were sent home from the team's practice facility, and didn't watch film with their teammates.

"They didn't feel great," Reid said.

Reid said both players would not practice before Friday. However, Reid didn't rule either player out for Sunday's game at Detroit.

"I can't tell you that," he said. "We have to go through and do exactly what the protocol calls for and that's the procedure that we're doing right now.

Kolb and Bradley will be evaluated on Wednesday and they'll see an independent specialist, as required by the league, on Friday.

Michael Vick, who nearly led the Eagles to a comeback win in a dynamic half of action, would get the start if Kolb doesn't play.

Reid again squashed any quarterback controversy.

"Kevin Kolb's the No. 1 quarterback," Reid said.

The Eagles lost Pro Bowl fullback Leonard Weaver (knee) and center Jamaal Jackson (triceps) for the season.

The Eagles placed Weaver and Jackson on the injured reserve list and signed former Seahawks fullback Owen Schmitt and tight end/fullback Garrett Mills. The Eagles had been carrying only two tight ends, and Mills also can play some fullback.

Schmitt, a fifth-round draft choice by Seattle in 2008, played in 30 games with the Seahawks. He caught 12 passes for 50 yards and one touchdown, and carried five times for 21 yards. Schmitt was released on Sept. 6.

Mills had been on Philadelphia's practice squad. Guard Fenuki Tupou agreed to a contract and will take Mills' spot on the practice squad.

Weaver tore the anterior cruciate ligament in his right knee. Reid called the damage to his knee "severe," and said a surgery date for Weaver hasn't been set.

Jackson tore his right triceps, not biceps as the team originally said. He will have surgery on Tuesday. Jackson was in the starting lineup after making a remarkable recovery from surgery to repair a torn ACL sustained last Dec. 27.

Information from The Associated Press was used in this report.