Liverpool defender Joel Matip will be out of action for up to three weeks after suffering an adductor strain in Sunday's 1-1 Premier League draw with West Bromwich Albion , manager Jurgen Klopp said.

The 29-year-old's injury comes at a time when the defending champion is already missing defenders Virgil van Dijk and Joe Gomez with long-term issues.

"The normal stuff with these kind of injuries ... (is) around about three weeks," Klopp told a news conference following Wednesday's 0-0 draw with Newcastle United.

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Liverpool tops the table with 33 points from 16 games and midfielder James Milner said he was pleased the side is setting the pace despite some lacklustre displays.

"I think it's a positive but it seems to be at this moment in time that nobody wants to take it by the scruff of the neck. We've dropped points, everyone seems to be dropping points," Milner said.

Liverpool will have to host home games behind closed doors again after the Liverpool City Region was placed into Tier 3 of Britain's COVID-19 restrictions on Wednesday.

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"It's important that we need to kick on now and try to get a few three-pointers. But the world is in a strange place at the moment and it's the same in football," Milner added.

"Everybody's lives are upside down, it's tough mentally for everybody and it's the same in football."

Liverpool travels to Southampton for its first game of 2021 on Monday.