Sturridge has made a notable impact since returning from his injury nightmare, where he missed half of the season.
Sturridge missed the majority of the campaign with thigh and calf injuries, which ruled him out of action for five months for the Reds and appeared to hit their campaign hard in the early stages of the season.
Moreno said: "You just have to watch him play to see how important he is.
"After being injured for so long, he scored a goal with his second touch [against West Ham]. You can see the type of footballer he is from that.
"Sturridge is a top player and everyone on the team was wishing he returned as soon as possible - and he's done brilliantly. He's a very important player for the team."
Having scored 24 goals in all competitions last season - combined with the departure of Luis Suarez - Sturridge's absence was likely to have a profound effect on the team, and while they were trying to address a leaky defence, Liverpool had trouble finding the net.
As a result, Rickie Lambert, Mario Balotelli and Fabio Borini all had their opportunities to lead the line in the 25-year-old's absence but all struggled for any sort of form, meaning Raheem Sterling was given the opportunity to lead the line with a change to a system that consists of a back three and wing-backs.
Sturridge has found the net on two occasions during his five appearances since his return and it didn't take him long to strike against West Ham United. He also found the net in the FA Cup win against Crystal Palace and caused Tottenham some problems, including winning a penalty in a 3-2 win over Mauricio Pochettino's side.
There's no doubt there's more to come from Sturridge as he works his way back to full fitness but it does beg the question as to how much he was missed during the early part of the campaign.
With Liverpool four points off the Champions League places, given the poor start they had to the season, they may feel they could have and should have taken more. Also, with a forward of Sturridge's calibre at their disposal they may well have been in a different European competition this week, while the lack of cutting edge in some games could be the difference from them sitting in their current seventh place, or the top four.