The three-time premiership-winning coach will extend his reign to at least a 20th season with the Storm after signing a five-year deal to stay at the club.

After a drawn-out negotiation process and speculation he would finish his head coaching career this year, Bellamy has knocked back big-money offers from the Broncos and the Sharks to stay in charge of the Storm.

Both the Broncos and the Sharks had offered him part-time coaching director roles worth big bucks, but on Tuesday Bellamy said he still has the passion to coach into 2022.

The flexibility of his five-year extension leaves the door open for Bellamy to continue his coaching career beyond next season, although he will eventually transition into a director of football role.

He will make that decision at the end of each year and will likely have a hand in selecting his eventual replacement.

It took 12 months of negotiations to reach a decision due to multiple personal and professional factors, but the 61-year-old settled on his future over the weekend.

"(Offers from Brisbane and Cronulla) were attractive with the conditions of the contract, with the money side of it, and both of those were part-time," he said on Tuesday.

"There wasn't that head coaching role, but that didn't make a difference to me, to be quite honest.

"In the end, when I decided to stay with Melbourne and go on as a head coach is because it's so late in the year and it would have been hard for the Storm.

"I know I've still got the passion and the drive to coach.

"The other two clubs were great, I was really impressed with both.

"They were very, very patient, but there were quality people involved as well.

"I would have been really content if I had have moved to one of those clubs."

Bellamy eventually wants to slow down and spend more time with family and has considered whether to retire from coaching at the end of the past few NRL seasons.

A clause in his new contract means he can do that on his own terms.

As for how long he can continue the rigours of an NRL season as a head coach, he's unsure, but knows retirement is coming.

"I don't know, to be quite honest. There's been times when I think this is just around the corner," he said.

"Sometimes it can wear you down, but it's like any other job.

"People talk about coaches and how tough the job is. It's stressful at times but it can be very rewarding.

"I'm getting a little bit older now and I've got grandkids and one of the main things is I'd like to spend a little bit more time with them."

His re-signing comes as a huge boost for the Storm as they prepare for a top-of-the-table clash with Penrith.

Bellamy's influence has never been clearer than this season after the retirement of Cameron Smith at the start of the year - yet they're still seemingly untouchable.

They head into Saturday's game riding a club-record-equalling 15-game winning streak and hold the record for most points scored across the first 17 rounds of an NRL season.

Australian Associated Press