"A fresh start is something that I needed. I was getting a bit stale there. I wasn't training as hard and started making a few excuses for myself, thinking I was going better than I was," he said.
"It was a bit of reality shock coming to Manly. No one cares what you've done or who you are. It's just about how hard you train. I just want to try and cement a starting spot now for NRL."
Built with the size of a back-rower but the skills of a halfback, Sironen said new coach Trent Barrett spent the summer encouraging him to bring out his creativity, and he responded with a two-try effort in Auckland.
"He just wants me to play, use my best qualities. I still have to do all that tough stuff out the back of the field like backrowers do these days," he said.
"If I get to play a bit creative like I can, so be it. 'Baz' has been really good. He was half the reason I went here. Just a good guy first, then a good coach."