Melbourne Storm senior assistant coach Adam O'Brien has notified the Club he will depart at the end of the 2018 season.

O'Brien, who's tenure at the Club has totalled 11 seasons, joined Storm in 2007 as an assistant coach with Storm's Under-20s side under Brad Arthur.

After four years he then moved into the NRL staff as a development coach, the role he held when Storm won the 2012 Premiership. He was promoted to assistant coach in 2014, taking charge of the team's outside backs and attack.

Since the start of 2017 O'Brien has taken on a senior assistant role under Head Coach Craig Bellamy and has been pivotal to the Club's success including back-to-back Grand Final appearances and the 2017 Premiership.

Such has been O'Brien's impact at Storm, he was awarded the prestigious Michael Moore Club person of the Year trophy in 2016.

Melbourne Storm Football Director Frank Ponissi said, "While we are very disappointed to see someone of Adam's calibre leave the Club we totally understand the reasons for his decision. Adam has handled the difficult decision to leave with the utmost professionalism.

"He's been a highly regarded coach at the Club and is extremely respected and liked by players and staff and has, along with his wife Sharyn, immersed himself in the Melbourne Storm culture.

"Adam is definitely a head coach in waiting and its been a pleasure watching his development as a coach over the last 11 years."

Storm will make an impending announcement on the coaching and football structure for 2019.