LONDON (REUTERS) - Liverpool defender Virgil van Dijk was unlucky to suffer a serious knee injury in last season's Merseyside derby against Everton but has bounced back brilliantly this term, manager Jurgen Klopp said before the teams meet again on Wednesday (Dec 1).

Van Dijk sustained an anterior cruciate ligament (ACL) injury following a reckless challenge by goalkeeper Jordan Pickford during the match in October 2020, which required surgery and sidelined him for the rest of the season.

The Dutch international's layoff hit Liverpool hard as they finished third, failing to retain the Premier League title.

But he has helped Liverpool keep eight clean sheets in 13 league games this season, providing solidity in central defence.

"We are all human beings so it's probably difficult to ignore something like that (the injury)," Klopp told reporters on Tuesday. "The situation wasn't (one) that can always happen in football... But Virgil is very experienced.

"He has to be completely free of all things that he could have in his mind because of one issue in the past... He has come back brilliantly (this season). He had a full pre-season which is absolutely helpful.

"Three games in a week, he looked fine but we gave him a break... Some things are not exactly that they used to be, but that's only a matter of time because of his quality."

Liverpool are third on 28 points, 13 points ahead of their local rivals Everton who are languishing in 14th spot.

However, Klopp said Liverpool will treat Wednesday's derby at Goodison Park like any other match.

"We know there are some special things around derbies but it's a football game as well, that's how we approach it," he said.

Joe Gomez (calf) and Naby Keita (hamstring) are expected to return to training next week, but Roberto Firmino (hamstring) and Curtis Jones (eye) remain sidelined.