The decision was made following a vote at an emergency meeting in the mining town on Wednesday night.

The Roosters will instead play in the Barwon Darling Cup this year.

The meeting was held following the Roosters' inability to field sides at last weekend's trial at Narromine.

There are certain criteria in regards to the move with the Roosters asked to rebuild during the year and then front the next Group 11 annual general meeting to ascertain if they are capable of returning to the premier competition in 2017.

It marks a sad chapter in the history of the Roosters, who have won four Group 11 titles, the most recent of those in 2006.

"I think it's the only decision they could have made," Group 11 secretary Ross McDermott said after attending the meeting at Cobar.

"We offered them the Castlereagh League as well but that starts this weekend so they couldn't fulfil the criteria there.

"But overall it's good for Cobar because they're still playing rugby league and they're passionate about it there."

Glen Davis, who was installed as Cobar president recently, refused to comment on the situation at this stage.

While it may come as a shock to some, the Roosters have spent the majority of the off-season battling with low player numbers.

The first crisis meeting was called in mid-February by the club's then-president John Claus following staff cutbacks at the Endeavor mine.

A number of the club's players were employed there so it came as a real blow.

According to McDermott, the Roosters had been having 18-20 players attend pre-season training.

But when it came to putting an under-18s, reserve grade and first grade side on the field last weekend at Narromine they fell well short despite 24 players promising they would play seniors.

While disappointed to see a club drop out of Group 11, McDermott said he had faith the Roosters could be restored and reiterated the fact that rugby league in the town would go on.

"Not long ago there was talk they were going to fold but no one wanted that and they voted unanimously to keep on going," he said.

"It's not good for Group 11 because it's a reduction in teams but Cobar are still playing footy."

With the ultimate goal being the Roosters back in Group 11 in 2017, McDermott confessed he was concerned the club may find themselves comfortable within Barwon Darling and find it difficult to return.

A first grade side, a junior side and a ladies' league tag side is what the Roosters are expected to play with this season against the likes of Bourke, Walgett and Collarenebri.

"There's no guarantee they'll come back to Group 11," he admitted.

"It's shame because they were strong in the late 1990s and early 2000s and had some great players so it is disappointing to see it happen."