The Reds are a whopping 22 points clear of Manchester City in the Premier League table and it is only a matter of time before they claim a first league title in 30 years.
But for all their dominance in the Premier League, they might not win anything else between now and the end of the season.
They are still in both the Champions League and FA Cup this season, and are in with a chance of a treble, but there is a long way to go.
The reigning European champions face Atletico Madrid in the last-16 of the Champions League and will travel to Chelsea in the FA Cup fifth round.
And Jenas insists they may have to win both if they are to be spoken about in the same breath as United in ’99.
“Liverpool’s challenge now is to become a team for the history books. They are capable of achieving that. But only then will we be able to compare Jurgen Klopp’s Liverpool to the modern-day benchmark – the Manchester United Treble-winning side of 1999,” he told the Daily Express .
“History will celebrate Liverpool’s dominance in the league. They may well be invincible this season.
"They could win the league ridiculously early in mid to late March. But what if they don’t add the European title and/or the FA Cup? What are they then?
"Just another team who won the title? Or the double like United, Arsenal and Chelsea have? They’d be just another successful team. They have the chance to be much more.
"Klopp’s squad have to become a team that we talk about in 20 years time, like the way we still talk about that United team.
"To do that you need to go and win the treble.
"That ‘99 team won the Premier League, but had already won it in four of the previous six seasons. Then they won it the two seasons after ‘99 as well.
"It was an era when United won eight titles in 11 years after the Premier League was formed.
"That is the difference. "When United won it in ‘99 they finished with 79 points in 38 games. Liverpool are already on 73 from 25 games. Does that make this Liverpool side better?
"I’d argue that United performance is relative to the strength of the league at the time. Arsenal and Chelsea, very strong teams, within four points of the top."