Cameron Munster will undergo scans on a shoulder injury which Melbourne Storm physios fear “may be serious”.

The five-eighth had to leave the field late on as Melbourne defeated Manly Sea Eagles 36-6 on Saturday to secure a third minor premiership title in the space of four years.

But losing Munster would mean the victory has come at a cost, with head coach Craig Bellamy revealing his player had already been a fitness doubt prior to the match.

Munster, 24, has been struggling with an issue near his left shoulder and neck, with the problem appearing to have been aggravated against the Sea Eagles.

Bellamy said: “We’re hoping it’s not too serious. The physios think it might be. 

“They don’t want to say anything that might be wrong. He’s a tough rooster as everyone knows. It might be worse than what they think, I’m not sure.

“He had something to do with his neck or shoulder. He was in doubt for this game, we ruled him in on Friday.

“I don’t think they [the medical staff] really know or want to say until they scan him.”

Aside from the Munster development, Bellamy was delighted to see Storm defy pre-season predictions by topping the Sydney Roosters in the regular season.

“There were some doomsayers who at the start of the year thought we might have dipped a bit,” he said.

“Not only have they been consistently good but consistently tough, especially mentally.

“This is the youngest group of players the Storm have ever had and some of those younger blokes have been outstanding this year.”

Storm face North Queensland Cowboys at AAMI Park next week, while their first match in the elimination finals will be on September 13.