Melbourne host Parramatta in their season-opener at AAMI Park on Thursday night with Bellamy's incredible round one record at major risk with the coach unbeaten since taking charge in 2003.
The departures of superstar fullback Ryan Papenhuyzen and giant prop Nelson Asofa-Solomona as well as injuries and suspensions mean a new-look side, particularly in the forwards.
Youngsters Cooper Clarke and Preston Conn are both in line to make their NRL debut from the bench.
Bellamy said he couldn't remember when his Storm line-up was so untested.
"It would have been at some stage, but I think it's a long time ago," the coach said.
"There's been a lot of big turnover in our squad - we've got a couple of new players in that haven't played first grade at other clubs, but more than anything, we're relying on our younger blokes."
The Storm conceded more than 40 points to Gold Coast in their last pre-season match while the Eels won both games, with Mitch Moses partnering former Melbourne young gun Jonah Pezet in the halves.
Bellamy said he hoped his trademark blast following the heavy loss had made an impression on his troops.
"Sometimes you don't really know until you get into the game ... our trial form wasn't great, so there's a couple of things there that we need to really tidy up on and we've had a couple of weeks to do it," he said.
"Our defence was really poor in the trial so that's something we really need to pick up on."
While much is made of Bellamy's run of not losing the opening match in 23 years, the coach said the side's performance was more important than any record.
"It's another round one game and it's not that important in the context of the start of the new season and getting back to playing our best footy, that's the thing," he said.
"It's probably going to take a little while to know what our best footy is."
Meanwhile, Bellamy said he was disappointed legal action this week didn't result in former Parramatta and NSW Origin flyer Zac Lomax landing at the Storm.
While Melbourne could have used his talent, particularly with Xavier Coates sidelined after surgery, the coach said he was more upset for Lomax, with fears he could be lost to the game.
"We're obviously disappointed that we couldn't get Zac here - he's a quality player, but even more than that, he's a quality person and he would have fit in here really well.
"But more than anything else, we're disappointed for him - I'm not quite sure what happens now with him.
"I think everyone in the game would like to see him stay in our game as he's an Origin player and he's played for Australia ... to lose him to another code would be disappointing."
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