Tottenham face possibly their toughest test of the season this weekend.
Mauricio Pochettino takes his Spurs side to Anfield, to take on the only unbeaten team in England's top four divisions.
Liverpool are six points clear at the top of the Premier League table, just under a quarter of the way through the season.
Tottenham have been in poor form, but got a much-needed morale-boosting victory in the Champions League on Tuesday night, sweeping aside Red Star Belgrade 5-0.
And they will need to produce the same kind of attacking prowess, and improve considerably at the back if they are to get anything from the game on Merseyside.
In amongst a poor season by their standards, Spurs have actually picked up impressive points on the road against Manchester City and Arsenal already this season.
And if they were to do similarly at Anfield on Sunday they would certainly put the cat amongst the pigeons in the title race.
There was a hope that Spurs would face a Liveprool side weakened by the absence of Mohamed Salah, after the Egyptian missed the draw with Manchester United last weekend, but Salah has returned to the fold and is expected to face Spurs on Sunday.
However, there could be a huge boost for Spurs with full-back Trent Alexander-Arnold missing.
The full-back has not travelled with the Reds squad to Genk for their Champions League encounter on Wednesday night as he has a virus and that could keep him out of the game with Spurs.
And his true value to Liverpool as a defender and in an attacking sense can be revealed by data from Wyscout.
Assists
Alexander-Arnold has two assists to his name in the Premier League this season, but his expected assists data is at 3.63.
He is second only to Manchester City's Kevin de Bruyne for expected assists in the league.
Crosses
The Liverpool right-back puts more crosses into the box than any other player in the Premier League. Considerably more.
He has delivered 69 balls into the box already this season, nine more than his nearest rival - team-mate Andy Robertson.
He is successful with 27.54% of those crosses.
Passes
He is fifth on the list for the number of passes this season, with 601. Team-mate Robertson is top with 697.
Alexander-Arnold has also tried 22 through passes, more than all but four other players in the Premier League this season and has made 11 key passes, which is a number only bettered by Kevin de Bruyne (17).
The Liverpool man is second only to Spurs' Toby Alderweireld for the number of long passes, while only Jorginho and Alderweireld have played more passes into the final third than him.
Alexander-Arnold also leads the way for the number of progressive passes this season (152) which is 20 more than the next best.
Conclusion
Alexander-Arnold is at the heart of Liverpool's passing game under Jurgen Klopp, and without him the Reds might have to try a different tack down the right hand side, which could hand Tottenham a boost on the day.
It remains to be seen whether or not the England right-back will be fit to play or not, but his value to Liverpool cannot be underestimated.
