City in the annual City vs Country Origin match. He was the third least experienced player to ever appear in the match. Later in the season, Braith Anasta was moved to five-eighth and Sironen played in the second-row. In the last 4 games of the year, Sironen scored a try in 3 games. 2014 After an injury-hampered 2014, where he was limited to 13 games, Sironen underwent shoulder surgery in the off-season. 2015 He played in the first 11 rounds of 2015 before undergoing neck surgery. Returning to first grade in July, he made 19 appearances for the season. Mostly playing in the second row, he was on the field for a full 80 minutes in 15 games. On 31 October 2015, Sironen needed to delete his Twitter account in the wake of a media story which arose that involved Sironen's former partner. According to reports, Sironen's ex-partner hacked into his Twitter account and posted a naked photo of him with another woman with the caption "I make excuses this is why my girlfriend who is tattooed on my arm left me". After the story was aired in the media Sironen tried to downplay the incident. 2016 Sironen played the opening two games of the season in the second row, before missing three with injury. Soon after his return, he was chosen in the City side for the third time. Sironen said, "As someone who wants State of Origin honours in the future this is one of the stepping stones. Earlier this season I had a hamstring niggle. I've just been trying to get my body healthy and play for the Tigers, I'm just worrying about that before anything else. If I can put all the drama aside I'll be able to one day achieve the goals I've set myself." In November 2016 it was reported that Sironen would opt out of his contract so he could join the Manly-Warringah Sea Eagles for 2 seasons starting in 2017. In the wake of Sironen leaving The Wests Tigers, his father Paul slammed coach Jason Taylor in the media as he claimed that Taylor was leaving his son out of the first grade side on purpose. After Taylor was terminated, Paul Sironen said "He punted me then got rid of my young bloke last year, Well, karma's a bitch, Good riddance & don't let the door hit you on the way out!".