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Philippe Coutinho will undergo a scan after being forced off with a suspected hamstring injury in Liverpool 's stunning 4-1 demolition of Manchester City.

The Brazilian playmaker, who scored Liverpool's second goal and created the third for Roberto Firmino, was substituted midway through the second half.

Coutinho left the Etihad complaining about some discomfort in his hamstring and admitted he has yet to discover the extent of the problem.

Losing Coutinho would be a major blow for the Reds with the classy attacker in outstanding form having scored four goals in his last three league appearances.

Boss Jurgen Klopp is hoping Liverpool's decision to immediately bring him off after he signaled that he was in pain will help prevent him from facing a lay-off.

"I hope we got there early enough," Klopp said.

"It was a little bit of cramp. He felt something.

"I hope that's all it was because everybody can see that he's very important to us. He's in really good shape in this moment and I hope we could react early enough."