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Sue Ogrocki, AP
Oklahoma City Thunder forward Serge Ibaka talks with official Eli Roe (44) after a foul call in the third quarter of an NBA basketball game against the Utah Jazz in Oklahoma City, Friday, Nov. 30, 2012. Oklahoma City won 106-94. (AP Photo/Sue Ogrocki)

OKLAHOMA CITY — One moment Wednesday, Marvin Williams was playing defense on New Orleans' Robin Lopez. The next, his head was crashing onto the court, raging with pain and spinning.

And, oops, he was going the wrong way.

"It hurt," Williams said Friday before the Jazz's 106-94 loss to the Thunder. "Initially, when I hit it, I tried to get up. Randy (Foye) said he was there, and he told me I started walking the wrong direction. … I was really dizzy for a few minutes."

Williams has gone through a series of NBA-mandated tests since then. He likely won't play again tonight in Houston, and it's unknown when exactly he'll be cleared to resume physical activity.

"I had a bad headache that night," the Jazz's usual starting small forward said. "But it's gotten better, for sure."

Williams still has a "little headache," but he's optimistic his condition is improving. He met with doctors in New Orleans and Oklahoma City, and stayed in bed resting for most of Thursday and Friday.

"(The doctor) just told me to rest up and make sure everything's OK," Williams said. "As long as I have a headache, they told me to take it easy. My headache has gotten better, but it's still there."

Williams won't be allowed to begin coming back to action until that headache completely goes away.

"It sucks," he said. "Anytime you miss time — I don't care who you're playing — you never want to miss time as a player and be away from the team."

Jazz head trainer Gary Briggs explained that the NBA's stringent concussion testing includes two pages of questions to be asked by a doctor; being headache-free for at least two days; a 15-minute stationary bike test; and checkups to make sure headaches don't recur.

"There have been so many studies of guys suffering from concussions later on, you have to take precautions," Corbin said. "It's for guys' best interest down the road."

Williams revisited the moment while the team was in Oklahoma City.

"I finally seen it, and it did look pretty bad. But it felt pretty bad," he said. "Once I start to feel much better, I'll get back to it."

Williams dealt with similar concussion symptoms, having hurt his head while playing for Atlanta a few years ago.

"You just take it easy," he said. "They go away and you come back slowly."

NO COMPLAINTS: The Jazz got to within five points of Oklahoma City when a game-changing play took place. Russell Westbrook had one of his seven steals after Earl Watson had stolen the ball from him.

Watson ended up on the ground. Corbin ended up on a ref's case, getting a technical foul. And OKC ended up getting a momentum-shifting bucket midway through the fourth that helped break the game open.

"I thought (Westbrook) hit our guy and got his hands on the ball," Corbin said. "The referee saw it a different way, and we had to deal with it."

Rather than mumble about not getting the call, Watson credited Westbrook, a guy he's watched grow up significantly since the OKC star played pick-up ball with him at UCLA when he was 16.

"Russ is aggressive. He made a great play on the ball. I lost the ball, fell down, and I think that was pivotal because we had a chance to score," Watson said. "I think it would've changed the momentum significantly. We could have built off of it, so it was a tough play. Sometimes I get those; sometimes I'm on the other end. So no complaints."

NO FAVORS: The Jazz just got Mo Williams back from his foot injury, and lost Marvin Williams for who knows how long because of his headache.

Now they could be without Derrick Favors. The key 6-foot-10 reserve left in the second quarter with a strained right arch and is doubtful tonight at Houston.

Favors said his foot has been bothering him for a couple of games, and it became unbearable to play on.

"It just started feeling weird," he said. "It was too sore. It still hurt."

HEADS-UP ANSWER: Corbin played in the NBA for 16 seasons back when the league wasn't as cognizant about concussions.

That explains the tongue-in-cheek response he gave when asked in a pregame media session if he'd ever suffered a concussion while playing.

"I probably had — just didn't know," the Jazz coach said.

Smiling, he added, "I may be concussed now."

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