Kansas City, Mo. ? Kansas City Chiefs quarterback Trent Green says the concussion that left him unconscious on Sept. 10 will keep him sidelined at least until after the Chiefs’ Oct. 8 game against Arizona.

Speaking publicly for the first time since absorbing the head-snapping hit in the season opener, the two-time Pro Bowler appeared to have lost a little weight. He said he was finally able to drive, and might even join the Chiefs on the sideline Sunday in their game at home against San Francisco.

“It’s just a day-to-day, week-to-week thing,” he said. “Every concussion is different.”

Getting back by Oct. 8, he said, would not “be reasonable.”

No one is putting a timetable on his return. Backup Damon Huard has been starting in place of Green.

“I told (the doctors), ‘When you guys give me the green light, I’m going. You’ve got to set parameters,”‘ Green said.

He has begun doing light work.

“They don’t want me to start running or getting into any heavy weight training or anything like that,” he said.

He said he remembered talking to his wife in the ambulance, but all memory for about 25 minutes after the hit has been erased. In light of the severity of the concussion, had he considered retiring?

“No, I have not. And I’ve made the point – I’m a very positive person and try and think the best. I don’t even want to answer that one. Because the people who have brought it up, I tell them, right now, that’s not in my plans.”

Green was going into a feet-first hook slide in the second half of the season opener when Cincinnati’s Robert Geathers came crashing in and hit him with his right shoulder, violently slamming the back of the quarterback’s head to the ground. Geathers was not penalized, a decision the NFL office upheld.

Green indicated he was not happy about that. He recalled the blow to the knees he absorbed from safety Rodney Harrison in 1999 when he was with St. Louis that led to four operations.

“It took the league six years to overrule that hit. At the time, they didn’t fine him or flag him and it took six years for Carson Palmer, Ben Roethlisberger and some other guys to get hit and all of a sudden, ‘Hey, we’re going to protect the quarterback’s knees,”‘ he said.

“My understanding of the rule is when you begin your slide, that you’re giving yourself up. And I was obviously beginning my slide. If you look, there were other Cincinnati players that saw me beginning to slide and avoided the contact. So I think it could have been avoided.”