Rugby league great turned pundit Braith Anasta believes Andrew McFadden could be sacked just four games into the 2016 NRL season.

The former Bulldogs, Roosters and Wests Tigers star told Fox Sports in Australia that McFadden will get a month to prove he can lead the star-studded Warriors team to glory, otherwise he's likely to be the first head coaching casualty of 2016.

"I think he's got a month, I really do," Anasta said.

"The first four games of the year, I think he's got to win at least two of them or else he is gone."

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The Warriors start their campaign with away games against the Tigers and the Broncos, before hosting the Storm and Knights. Going on the form of those teams in 2015, winning the first and last of those games should be achievable.

However, the Warriors go into the new season on an eight-game losing streak.

One area where Anasta feels the Warriors need to make a big improvements is in defence and he believes the arrival of new defence coach Justin Morgan, from the Storm, should help sort out those problems.

"Melbourne really improved their defence this year, which is I think why they did much better this year than last," Anasta said.

"That's I suppose a good support base to have around him and that's what they need to improve the most, so I think that will work out good for McFadden."