Jan Molby is convinced Anfield's famous 12th man can play a role in helping Liverpool to pass what he regards as their toughest test of the season so far.

The great Dane has been hugely impressed by Roberto Mancini's league leaders this term and believes the Reds support can play a vital role in helping to overcome them.

Molby said: "Sunday's game with Manchester City will be Liverpool's biggest examination of the season yet, no doubt about it.

"City are the only top side Liverpool are yet to face, and head to Anfield well clear at the top of the Barclays Premier League table.

"And while Kenny Dalglish's side have faced the likes of Manchester United, Arsenal and Tottenham, and won so impressively at Chelsea last weekend, City will pose a completely different threat. One that Liverpool will need to be very, very wary of.

"And if the Reds are to get a result on Sunday - against a side that has won 11 of its 12 league matches this season, don't forget - then I feel the fans will have a major role to play.

"Anfield needs to be a cauldron for games like this. It was when City last visited, back in April, and Roberto Mancini's side didn't handle it at all well. Andy Carroll got amongst them and they wilted.

"Kenny will want something similar this time out, I'm sure.

"He will know the threat City pose from all areas. People single out David Silva, and he is a fantastic player of course, but they have players all over the pitch who can hurt you - Balotelli, Dzeko, Toure, Aguero, Johnson, Milner.

"Liverpool need to be aggressive. They need to play at a high tempo and try to ruffle City.

"For that, the crowd can play its part.

"It won't be easy, of course. The likes of Silva and Dzeko played here last season, and they will know what Anfield is all about. They are experienced players, class players, and will not be fazed.

"But they are arriving at Anfield on the back of a poor defeat in Napoli, and there could be a hangover from that.

"The press have had a field day on their 'failings' in the Champions League, but the Premier League is their bread and butter.

"Liverpool will need to be on their game on Sunday, and the Anfield crowd could make the difference."