The announcement of 2 during Microsoft's pre-E3 conference was taken a coup for the 360, but some members of the game's community disagree; worried as they are that this will mean the end of continuing support for the original game.

Speaking in the wake of a petition against this week, boss man has said that new content will continue to be released for the seminal title.

"From a customer's perspective, we think that given the sort of insane popularity of Left 4 Dead, that people are going to be super excited about getting a sequel to that," Newell told G4.

"We're going to continue to do Left 4 Dead updates and release more content for Left 4 Dead, and then also have Left 4 Dead 2 coming out as well."

20,000 people have so far signed the petition against the sequel, so Valve are clearly keen to head-off this stir.

By Luke Guttridge