Liverpool captain Steven Gerrard has rapped their performance in last week's 0-0 draw at home to Fulham.
In his match programme notes for last night's victory over Olympique Marseille, Gerrard wrote: "With all due respect to Fulham, that should have been a bread and butter three points for us.
"You need to make the most of your home games in the Premier League. We were fortunate in one respect in that the other results at the weekend didn't really harm us.
"But we feel that Saturday was a missed opportunity. If we'd taken three points off Fulham then we'd have been two clear of Chelsea and 10 ahead of United, although they have a game in hand.
"It wouldn't have been decisive right now, but any opportunity that you get to put your rivals under pressure is one that you should be looking to take.
"But it's gone, and we won't be dwelling on it. So long as we have learned a valuable lesson and improve our performances off the back of that draw then we'll be fine.
"But it's a warning, just like Stoke was, of what can happen if we're not on top of our game."