Melbourne Storm fullback Billy Slater says he is cherishing what could be his last finals series in the NRL.

Slater has played close to 300 first-grade games but injury ruled him out of the Storm's knockout matches in 2015 and 2016. He's enjoyed an injury-free year and is looking forward to adding impact to the Storm over the few weeks.

"This year I've got an opportunity to play [finals] and I'm really looking forward to playing my best football," Slater said.

The Storm champion still hasn't decided on whether to play on next year, but insists winning a premiership wouldn't influence his decision to retire.

"I need to focus on each game. It's short term for me," he said. 

"If next year comes around and I feel like I can contribute to the team and I want to play on, I'll be standing here next year. But until then, I'm just focusing on enjoying the moment and what I have in front of me.

"I've always said it's physical with me. Mentally you can sign me up for another three years, I'm there to play. 

"I've won premierships before. It's not the be all and end all."