Danny Amendola still doesn’t know the full extent of his shoulder injury (Seth Perlman / AP)

Danny Amendola needed only two plays on Thursday night to show a national audience just how important he is to the St. Louis offense.

But now the Rams must find a way to get by without their most reliable receiver.

Amendola injured his right shoulder while diving for a pass in the second quarter of St. Louis’ 17-3 upset of previously unbeaten Arizona last night.

He left the game and was shown on an NFL Network TV camera hurling his helmet into a wall in the tunnel in frustration. Amendola did not return and held his right arm in a sling for the remainder of the game. ESPN’s Adam Schefer reported Friday that Amendola will undergo further tests after initial tests to determine if he suffered a broken collarbone on the play were inconclusive.

After the game, Rams general manager told ESPN.com’s Jeffri Chadiha that the team expected to have a diagnosis at some point today and expects the 26-year-old receiver to play again in 2012.

Amendola had a career day in Week 2 against Washington when he caught 15 passes for 160 yards and a touchdown in a 31-28 win.

On Thursday, Amendola hauled in a 44-yard reception from Sam Bradford while falling backward – and he made the grab using only his left hand. Despite not catching another pass in the game, Amendola is tied with Victor Cruz for first in the league in receptions (32) and is fifth in receiving yards (395).

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