Edmonton Oilers rookie phenom Connor McDavid left Tuesday night's game against the Philadelphia Flyers with an upper-body injury that will keep him out of the lineup "long term," according to head coach Todd McLellan.

Multiple media reports claim that he broke his collarbone. Oilers general manager Peter Chiarelli will provide an update at Wednesday's 12:30 p.m. ET news conference.

"He's got an upper-body injury that is going to keep him out long term," said McLellan. "It was a hockey play, he went to the net hard like he always does, he comes off that wing with a lot of speed. Three guys got tangled up in the corner. It was a hockey play.

The 18-year-old centre went down with 1:44 remaining in the second period. McDavid skated around Flyers defenceman Brandon Manning and fired a shot on net, but fell awkwardly in the process.

McDavid got tangled up with Manning and his defensive partner Michael Del Zotto. The three players crashed into the boards, with McDavid taking the brunt of the impact in his left shoulder and head.

"He's disappointed he got injured," McLellan said. "It's his rookie season and things were going very well."

McDavid left the ice favouring his left shoulder. He was seen wearing a sling in the hallway behind the dressing room and did not return for the third period.

The Oilers skated to a 4-2 win.

McDavid, the first overall selection in the 2015 NHL Entry Draft, had 12 points in his first 12 games and was named the Rookie of the Month for October.

Fans and teammates were quick to voice their concerns and extend well wishes to the rookie.

"It's never good when someone doesn't come back in a game and he's a guy who would be on the ice any time he could, so that doesn't bode well," said Edmonton left-winger Taylor Hall. "We'll see what the prognosis is, but you never want to see a guy out of the lineup, especially one just starting out his career.