[7] She first appeared with the club's representative women's team, Pellicans 2000 Naiset, in the 2009–10 season of the third-tier Naisten Suomi-sarja, playing in three qualification games at age thirteen.

While primarily appearing with the Pelicans 2000 minor teams for her age group over the subsequent two seasons, she sporadically played with Pellicans 2000 Naiset, notching her first senior league assist in 2010–11 and her first goal in 2011–12.

[8] After completing her studies in Kuortane, Viitasuo joined the roster of JYP Jyväskylä Naiset, which featured many Finnish national team players, including Meeri Räisänen, Riikka Sallinen, Marjo Voutilainen, among others, and was captained by one of the best active defencemen in the world, Jenni Hiirikoski.

They kept up the momentum in the playoffs, steamrolling through the quarterfinal and semifinal rounds before sweeping HPK Kiekkonaiset in the best-of-five finals to claim the 2016 Finnish Championship title.

In the summer following the Aurora Borealis Cup victory, the operating association of JYP Naiset, Hockey Cats ry, declared bankruptcy, and the team was financially relegated from the Naisten SM-sarja.