Melbourne flyer Josh Addo-Carr is bigger and stronger in 2019 and he's issued a warning to the rest of the competition that he'll be better.

Possessing a resume that would be the envy of most 10-year veterans, the 23-year-old winger believes he is still on the improve and his best football is in front of him.

Addo-Carr has already achieved plenty during his two seasons in Melbourne.

After nine games with the Wests Tigers in 2016, he joined the Storm the following season and quickly rose to prominence with 23 tries and a premiership in the same season.

While 2018 didn't provide him with the ultimate team success as the Storm fell to the Roosters in the premiership decider, Addo-Carr did make his State of Origin debut and played a big part in helping NSW win just their second series in 13 years.

One could easily excuse Addo-Carr of resting on his laurels after such a whirlwind start to his career, but that's exactly what has him searching for more.

"I think there is still a better Josh Addo-Carr to come," he boldly told NRL.com.

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"I think I can be a lot better and I always strive to be better. Take a look at Cam [Smith]. He started off good, but he's gotten ever better over the years."

Addo-Carr added eight kilos to his lean frame in an attempt to strengthen his defensive capabilities and remains hopeful the extra weight won't hinder his renowned blistering speed.

"I would like to think I am the fastest player in the NRL," Addo-Carr said.

"I ran 10.6 seconds (for 100m) back when I was 16 or 17 in high school and I reckon I am quicker now.

"Everyone speaks about me and James Roberts, but you have got Alex Johnston, Bevan French and Waqa Blake too.

"You've got heaps of players that are fast and you don’t really know who is the fastest until they are all very fresh and have no fatigue."

Addo-Carr ran in 18 tries and handed off five try assists during the Storm's 2018 campaign as he tried to become a more complete player in attack and in defence.

He wouldn't be drawn on how many tries he might be able to score in 2019, instead deflecting the praise for his try-scoring prowess to the strong work of his teammates.

"We get recognised for scoring tries, but it’s just the team that I am playing in," he said.

"You see me scoring all these flashy tries, but you never hear the commentators say anything about the forwards.

All of Josh Addo-Carr's tries of 2018

"They hold people up and Suliasi (fellow Storm winger Suliasi Vunivalu) and I just score tries on the edges. Everyone is doing their job and doing their part for the team."

While a Kangaroos jersey may be on the horizon for Addo-Carr if he can continue his recent upward curve, "The Foxx" remains purely focused on performing each week for his club.

"All I am focused on is playing good football for the Storm," he said.

"That's my first goal and the rest will just snowball from that.

"It was a massive privilege to pull on that Blues jersey last year and hopefully I get to play in the green and gold one day too."