Clyne, 28, was injured during the defeat by Borussia Dortmund last week and has flown home for treatment.

The England player is out of contract next summer and had been linked with a return to former club Crystal Palace.

Reds manager Jurgen Klopp said the team were "gutted" at the news.

"He was training and playing so well - he was in outstanding shape," the boss added.

"Clearly an injury of this nature isn't a happy moment for any player, but the silver lining for him is that, according to the medical guys, it's a straightforward ACL injury.

"This means fixing it and coming back from it should follow a path that is free from pitfalls and complications."

Liverpool say the defender has a clean tear of his anterior cruciate ligament and expect Clyne to return to fitness in six months - late January 2020 - as a result.

Clyne joined Liverpool for £12.5m in July 2015 but lost his first-team place to Trent Alexander-Arnold and spent the second half of last season on loan at Bournemouth.