Molby said he would happily take a draw in another huge early season fixture for the Reds, but says he is unconvinced by Louis van Gaal's side who, like Liverpool, have taken seven points from their opening four Premier League games.
The Dane said: "They don’t convince me, whatsoever. And spending big money on a kid from Monaco won’t change that.
"I’ll be interested to see how Liverpool approach the game. Me, I’d be looking at something similar to the Arsenal performance; organisation, solidity, counter attacking threat. But I’d also be really pleased to see Benteke have someone up alongside him to bring him to life. Danny Ings did himself no harm in that respect against West Ham.
"I suppose if you asked a lot of supporters, they’d take a draw now."
With Philippe Coutinho suspended for the short trip down the East Lancs Road, there is an opportunity for somebody else to come into the side, and Danny Ings may find himself in the starting XI after his brief cameo against West Ham United last time out - where he looked lively, if unspectacular.
One thing is for sure, Liverpool will be looking to tighten up, having been breached three times by the Hammers after securing three successive clean sheets. Both sides will be looking to show they can bounce back well from defeats, with United having lost to Swansea City last weekend after leading early on in the second half.
It's a big test for both sides, but Liverpool need to take confidence from their performance against Arsenal, and if they can find their scoring touch, then they will show they can respond positively to hugely disappointing displays.