Shanahan said Griffin was experiencing no dizziness, headaches or vomiting Monday, a day after the No. 2 overall draft pick suffered a concussion in a loss to the Atlanta Falcons.
Shanahan emphasized that Griffin will have to go through a series of tests to satisfy the NFL’s return-to-play protocol. If there are any setbacks during the testing, the coach almost certainly will start Kirk Cousins or Rex Grossman against the Vikings.
Griffin was knocked out in the third quarter against the Falcons on a legal hit by linebacker Sean Weatherspoon.
PATRIOTS: Wes Welker told reporters he was only joking when he said after Sunday’s game that he enjoyed catching 13 passes against the Denver Broncos to “stick it” in coach Bill Belichick’s face.
Welker made a rare Monday appearance in the locker room during media availability to straighten things out.
“It was a joke,” Welker said. “I don’t know what else to say about it.”
• Running back Kevin Faulk says he is retiring after 13 seasons.
STEELERS: Safety Troy Polamalu won’t play Thursday night against the Tennessee Titans because of the right calf muscle injury he aggravated in Sunday’s 16-14 win over the Eagles, coach Mike Tomlin said.
CHIEFS: Quarterback Matt Cassel sustained a concussion in the fourth quarter of Sunday’s game against Baltimore and is unlikely to play in next weekend’s game at Tampa Bay. Brady Quinn is expected to start in his place.
TITANS: Coach Mike Munchak says quarterback Jake Locker will miss his second consecutive game with an injured left shoulder Thursday when the Titans play the Steelers.
CARDINALS: An already embattled running game took a severe blow with the announcement that running back Ryan Williams is out for the season with a left shoulder injury that will require surgery.
The Cardinals already are without Beanie Wells until at least Thanksgiving weekend because of a severe turf toe injury.
VIKINGS: Strong safety Harrison Smith won’t be punished further for his shove of an official that drew a 15-yard penalty and automatic ejection from Sunday’s game against Tennessee.
GIANTS: Rookie safety Will Hill was suspended by the NFL for using Adderall, the same prescription drug that teammate Tyler Sash used. Hill will be eligible to return on Nov. 5.
BENGALS: Running back Bernard Scott will miss the rest of the season with an injured left knee.