Liverpool reclaimed the lead in an enthralling Premier league title race as Alexis Mac Allister's thunderbolt and a late header by Cody Gakpo secured a nervy 3-1 home victory over bottom club Sheffield United on Thursday.

Liverpool have 70 points from 30 games, two ahead of Arsenal and three more than champions Manchester City, both of whom won on Wednesday to crank up the pressure.

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A bizarre opener by Darwin Nunez after 17 minutes when he closed down keeper Ivo Grbic and blocked his attempted clearance into the net looked set to open the floodgates as Liverpool sought the win they needed to dislodge Arsenal from the top spot they claimed a day before.

But Jurgen Klopp's side were way below their best and United stunned the Anfield crowd shortly after half-time when a Connor Bradley own goal levelled the scores.

The visitors looked capable of hanging on for a shock point before a loose ball came out to Mac Allister in the 76th minute and he smashed a swerving right-foot effort into the top corner.

Gakpo then made sure of the points in the 90th minute as Liverpool took another step towards the perfect Klopp send-off as the manager prepares to leave at the end of the season.

"We had to dig very deep, but that is normal. Our attitude was good, the football was not great in a lot of moments," Klopp said. "Then Macca's goal was the complete game changer."

United are 10 points from safety at the bottom of the table and look set for a swift return to the Championship.

If the key to winning titles is to keep grinding out wins even when performance levels dip, then Liverpool have the knack.

United were supposed to sacrificial lambs under the Anfield lights but gave their hosts a mighty scare until Argentina midfielder Mac Allister's moment of magic settled the nerves.

Liverpool were struggling to quell a lively United side but Mac Allister took matters in to his own hands with a finish that sent the home crowd into raptures -- his fierce shot spinning and rising into the top corner past a helpless Grbic.

"You're hoping that shot flies into the Kop and you write off a few more seconds. But that's why these are world-class players, they go right to the end and more," a rueful Sheffield United manager Chris Wilder said.

If that was spectacular, Liverpool's opener had been comical as Grbic took too long to make a routine clearance and Nunez jumped to block with the ball rebounding into an empty net off the Uruguayan who had his back to goal.

Liverpool had begun in sloppy fashion with James McAtee wasting a first-minute chance for the visitors when his effort was saved by Caoimhin Kelleher.

Despite having a remarkable 83% of possession Liverpool never looked secure and an increasingly confident United equalised when Gustavo Hamer met a cross with a header which glanced in off the leg off the unfortunate Bradley.

Liverpool would not be denied though and chalked up their seventh win in their last eight league games.