From chasing an unprecedented quadruple of trophies three months ago to without a win in three games, Liverpool faces a lot of questions after an unusually slow start to the season.

A 2-1 defeat at Old Trafford on Monday saw Jurgen Klopp's men leapfrogged in the fledgling English Premier League table by a Manchester United side that had spent the past week being ridiculed for losing 4-0 at Brentford.

Liverpool's worst start for a decade leaves the Reds already trailing defending champion Manchester City by five points and early leader Arsenal by seven.

"It's not the nicest thing to look at, that's clear," said Klopp on his side slipping to 16th after three games.

Of even more concern for the German is that there does not appear a quick fix for the issues that have caused such a slow start.

An early season injury crisis meant Thiago Alcantara, Naby Keita, Ibrahima Konate, Joel Matip and Diogo Jota were among those unavailable for the trip to Old Trafford.

Darwin Nunez was also missing after Liverpool's new 75 million euro ($77 million) striker served the first of his three-game ban for the red card he received for headbutting Crystal Palace defender Joachim Andersen last week.

Nunez's arrival from Benfica accounts for most of Liverpool's spend in the transfer window and the decision not to refresh Klopp's midfield options is a growing source of frustration among the Reds' support.

Without Thiago and Keita, the 36-year-old James Milner and Harvey Elliott, 19, lined up either side of captain Jordan Henderson in midfield Monday.

Klopp admitted before the game that it would be "cool" to have another midfield option.

Alexander-Arnold targeted

That is not the only area of concern for Klopp.

Trent Alexander-Arnold's defensive positioning is being increasingly targeted by the opposition.

Following on from Real Madrid's winner in last season's Champions League final and Fulham's joy on the opening weekend of the season, an attack down Liverpool's right was the source of United's first goal.

Virgil van Dijk has also looked far from the world's best center back in recent weeks and was on the receiving end of a telling-off from Milner for his role in giving Jadon Sancho the space to slot home the opening goal.

Up front, the loss of Sadio Mane to Bayern Munich is hitting hard with Roberto Firmino looking like a spent force as he deputized for Nunez.

Slow starts are also a common theme in Liverpool's recent struggles.

It has now conceded first in its last seven Premier League games stretching back to the end of last season.

"We're giving every team a goal start, we can't keep giving ourselves an uphill battle," said Andy Robertson.

"In the warmup, it was the quietest I have heard this stadium and they wanted something to lift them and we gave them it.

"Two points from nine is not the start we wanted. We need to pick up our performances individually and collectively.

"It is easy to talk about it in the changing room but we have to go out and do it. We can't keep conceding goals. They started better than us today. It needs to change."

A first defeat in 31 games in domestic football stretching back to December is no time for panic.

But City and Liverpool have raised the bar in jousting for the title over the past five years with in excess of 90 points now normally needed to be crowned champion.

To reach those heights again, Klopp's men have no time to waste in awakening from their early-season slumber.