Liverpool have managed to keep two clean sheets so far this season.
The defence is under the microscope this season for Liverpool having been guilty of leaking cheap goals during the last two seasons, but so far they have got off to the best possible start at the back.
In his Liverpool Echo column, Molby wrote: "Particularly in terms of building defensive partnerships.
"You don't have to be a genuine to determine what Liverpool have been working on most during pre-season.
"Whereas we have pressed all over the pitch in the past – and still do – now the players are very, very quick to drop into position when we are without the ball.
"That's discipline. That's something you work on in training. And that has made us a different team to the one that ended last season.
"It is working well so far – you can't do any better than two clean sheets in your first two games."
There have been a lot of changes to Liverpool's defence over the past couple of years, and the summer has been no different with new signings Nathaniel Clyne and Joe Gomez occupying the full back roles, and Dejan Lovren given the nod ahead of Mamadou Sakho to partner Martin Skrtel so far.
So far Liverpool have only faced three shots on target so other sides have been unable to be clinical, but the real challenge is for the Reds to keep it up for the duration of the season, though it is welcome for the Reds they have managed to find a way to grind out results in the early stages of the season.
They're coming up against one of the better attacking sides in the country on Monday when they face Arsenal, so if they can maintain the same kind of defensive solidity as in the opening two games, they are in with a chance of getting a decent result.