Vikings CB Cook to play for Vikings on Sunday

"It'll be a big challenge for him. The downside is he hasn't had much build up to line up against guys who have been playing week in and week out," Frazier said. "So you have to take his play a little bit with a grain of salt."

Cook said he noted the games against Houston and Detroit when the schedule came out in April, excited about the opportunity to face star wide receivers Andre Johnson and Calvin Johnson. He missed the last meeting against Calvin Johnson and the Lions.

"I've been through a lot of adverse situations so this one was a little bit easier to deal with than my other two," Cook said, adding: "It's not like I haven't done it before. I can come in and still be able to perform in a situation like that."

Also, defensive end Brian Robison returned to practice Friday with his sprained right shoulder and was listed as questionable on the injury report to face the Texans. Frazier said he's improved this week, but whether he'll be cleared to play or not was another matter.

"He did enough in practice today that creates some encouragement amongst our staff and his teammates as well," Frazier said.

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