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Liverpool fear goalkeeper Alisson Becker could be out for six weeks after picking up a calf injury against Norwich.

Alisson had to come off in the 39th minute of the 4-1 win against the Canaries having gone down clutching his calf after slipping while playing a goal kick.

Jurgen Klopp admitted he faces a goalkeeping shortage if the Brazilian is ruled out for a lengthy period, and an initial assessment indicates the keeper could be out until the end of September with a torn calf, which would mean he would miss Liverpool's first Champions League game.

Alisson is likely to miss Premier League games against Southampton, Arsenal, Burnley, Newcastle and Chelsea.

"It's the calf and that's it," said Klopp after the victory against Norwich.

(Image: REUTERS)

"He couldn't carry on, that's not a good sign, and we have to see. Wednesday he will not play. With all my experience I can say that already."

Adrian, just four days after signing for the club on a free transfer, came on to make his Reds debut as Alisson hobbled off, and the 32-year-old now stands to start against Chelsea in Istanbul.

(Image: PA) (Image: REUTERS)

But whether Klopp is able to select a goalkeeper on the bench remains to be seen with the Reds boss admitting his options are extremely short with the other goalkeeper in the senior squad, Caoimhin Kelleher, recovering from a broken hand.

"Caoimhin is back in training but he's not 100 per cent, we have to see how he reacts now," he said.

"One of the younger ones is not allowed to play, he's only 16, and the other one had an elbow injury early in the pre-season. So yeah, we're a bit short in that position."