Molby suggests Danny Ings should be given a start at Old Trafford.
In his Liverpool Echo column, the Dane suggests that playing with two front men could cause plenty of problems for the United back line.
He wrote: "Christian Benteke is an out-and-out striker but Danny Ings works around a striker and is very mobile.
"Whereas Chris Smalling is playing ever so well, Daley Blind doesn't give you the impression that he's a centre-half even though he's a fine reader of the game.
"If you can get him pushed back and use your physical presence against him that just might be a route to cause them some problems."
With Philippe Coutinho suspended for the weekend after his dismissal against West Ham United, there is an opportunity to give Ings his first start.
Given that Ings likes to press the opposition, there could be times when he could run the channels and play off the flanks, but also give Liverpool the opportunity to switch their set-up mid-game if they feel one plan isn't working and wish to swiftly change to another.
It's interesting that Molby also highlights Daley Blind as a potential target for the Reds, and Christian Benteke may seek to play off the Dutchman, given the difference in height. It may seem an easy match-up on paper, but the midfield protection that United can offer could leave Benteke isolated so the visitors may need to be a bit more nuanced in their approach.
The movement and pace that Ings could provide can make that particular tactic quite effective.