Scary moment NFL star Marvin Harrison Jr struggles to stand after brutal hit to the head… before quickly being ruled out with a concussion

Cardinals rookie Marvin Harrison Jr. was left dazed — and briefly unable to stand upright — after suffering a concussion from a brutal blow to the head.

The wide receiver, the No. 4 overall pick in the NFL draft, had to be helped off the field after his helmet collided with the thigh of Green Bay linebacker Isaiah McDuffie.

In worrying scenes, Harrison Jr. was seen climbing to his feet before stumbling and falling back onto the grass as McDuffie watched with concern.

The 22-year-old son of Hall of Fame receiver Marvin Harrison was taken to the injury tent for evaluation.

Harrison Jr. eventually walked into the tunnel before the Cardinals confirmed his afternoon was over.

Cardinals rookie Marvin Harrison Jr. was ruled out due to a concussion against the Packers

The wide receiver struggled to get up

Later he fell to the ground

Harrison Jr. got up, but they stumbled and fell back to the grass before he was ejected

‘WR Marvin Harrison Jr. (concussion) is out of the question,” Arizona said on social media early in the second half.

Harrison Jr. is one of the most exciting players in football. He had 279 yards and four touchdowns on 17 receptions in his first five NFL games.

In Sunday’s 34-13 loss to Green Bay, Harrison was targeted twice by quarterback Kyler Murray but did not get a catch.

The Cardinals also ruled out defensive tackle Bilal Nichols with a stinger. Nichols had one tackle in the game and ten tackles in six games this season.