Trent Alexander-Arnold is expecting a difficult test when Liverpool head to Vicarage Road on Saturday bidding to move within one more victory of becoming Premier League champions.

Jurgen Klopp’s side were forced to come from behind to beat West Ham United 3-2 on Monday to secure a win that leaves the runaway leaders needing only four more victories to lift their first league title since 1990.

With a 22-point advantage at the summit, it is increasingly appears a case of when – and not if – the Reds are crowned champions but the England full-back is taking nothing for granted.

"Obviously we're quite close but they're four very tough games,” Alexander-Arnold told the club website. "Anything can happen in the Premier League and we've learned that over the course of our time playing in it, it's difficult for us.

"It will be difficult, we understand that but our main focus is on the next game and recovering for that because going to Watford is not an easy task and teams have learned that over the course of the season.

"We learned that when they came here, it was a tough game,” he said of Liverpool’s 2-0 victory over the Hornets in Nigel Pearson’s first game at the helm in December. “We scored in the last minute in that game, so it was a tight one. And we understand that, with the new manager that they've brought in, it's difficult to break them down.

"So for us, our mentality needs to be 100 per cent and we just need to focus on that and then after that we'll focus on the next game."

Liverpool will take on the Hornets knowing that another three points will see them break the English top-flight record of 18 consecutive victories, set by Manchester City in 2017, while Alexander-Arnold also has his eyes on beating a milestone of his own.

The 21-year-old set up two of his side’s goal against the Hammers to move on to 12 assists for the season, equalling his record for a defender in a Premier League campaign.