Darren Fells was forced out of Sunday's game due to a shoulder injury. USA TODAY

Arizona Cardinals tight end Darren Fells was forced out of Sunday's game at the Pittsburgh Steelers with a shoulder injury.

Fells, who entered the contest with nine receptions and a pair of touchdowns, had his left arm in a sling after the game and is scheduled to undergo an MRI exam on Monday.

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"We don't the severity of it," said Cardinals coach Bruce Arians, who listed Fells as the only injury of note.

In his second year with Arizona, the 6-foot-7, 281-pound Fells had his best game in the season opener versus New Orleans, hauling in four catches for 82 yards and a touchdown.

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