Amendola ruled out after hurting right shoulder

St. Louis Rams wide receiver Danny Amendola injured his right shoulder on a diving attempt at a catch in the second quarter against Arizona on Thursday night.

ST. LOUIS -- St. Louis Rams wide receiver Danny Amendola injured his right shoulder on a diving attempt at a catch in the second quarter of Thursday night's 17-3 win over the Arizona Cardinals and was later ruled out for the rest of the game.

A TV camera caught Amendola flinging his helmet into a wall with his left hand while walking in a tunnel to get X-rays. He had the arm in a sling after the game, but the Rams did not make him available to reporters.

Rams general manager Les Snead told ESPN.com's Jeffri Chadiha that the team won't know Amendola's diagnosis until Friday. Snead said Amendola's clavicle doesn't appear to be broken, and he expects him to be able to play again this season.

Amendola had a 44-yard reception on the Rams' first drive, setting up a TD pass from Sam Bradford to Lance Kendricks. Amendola entered the game with 31 receptions, second in the NFL, with two TDs and an 11.3-yard average.

Amendola missed virtually all of last season after dislocating his left elbow in the opener.

Also, Rams safety Quintin Mikell suffered a head injury in the second quarter while tackling tight end Rob Housler after a 13-yard pass from Kevin Kolb. Some players from both teams took a knee to pray while coaches and trainers attended to him, but he was able to walk off on his own.

Mikell did not return but later tweeted: "Thanks Everyone For Checkin Up On Me. I'm Good. Just Happy We Won!!"

Cardinals running back Ryan Williams was injured when he took a hit to the left shoulder and the side of his helmet at the end of a run.

Williams gained 12 yards on the play early in the fourth quarter before being hit by Darian Stewart. Williams slammed his helmet down after reaching the sideline.

Williams had 14 carries for 33 yards filling in for Beanie Wells, who missed the game with turf toe and is out until at least the ninth week of the season.

Earlier, Cardinals linebacker Reggie Walker was sidelined by a blow to the head.

It wasn't immediately clear when Walker, the backup behind Daryl Washington at an inside linebacker spot, was hurt. The injury was announced in the second quarter.

Walker has played in all four games as a reserve and on special teams.

Information from ESPN.com's Jeffri Chadiha and The Associated Press was used in this report.