He became the driving force behind Torino's 2005–06 promotion campaign, making 42 appearances, scoring twelve times, as the club clinched a spot in the Italian top flight the following season.

[4] Dick Advocaat, then-manager of Zenit who planned to quit the club at the end of the year to become Belgium coach, declared himself unhappy with the acquisition of Rosina and Sergei Kornilenko, labelling them newly appointed sporting director Igor Korneev's creatures, as the Dutch gaffer wished to sign two top-class forwards, namely Goran Pandev and Paolo Guerrero, instead.

[5][6] Nevertheless, Rosina made his debut on 5 August 2009 against FC Nizhny Novgorod in Russian Cup, also scoring his first Zenit goal, and played full 90 minutes in subsequent league game against Tom.

Despite finding little playing time through tough competition, Rosina had impressed on occasions, achieving a total of two goals and two assists in nine RFPL games out of remaining fourteen.

Being used mainly as a substitute, he managed to contribute with a vital assist against archrivals Spartak Moscow, finding Nicolas Lombaerts' head with a perfect cross in a game that finished 1–1.

As Spalletti settled to a counterattacking 4–3–3 or 4–2–3–1 formation with two wingers, and established internationals Danny, Konstantin Zyryanov and Danko Lazović all being options on the left, left-footed Rosina was mainly used in the rotation on the right as a backup for Bystrov.

On 14 August he was included in the starting line-up against Amkar and put off a dynamic performance, but due to below-par passing and general lack of end product he was substituted even before the break.

Despite this, Zenit head coach Luciano Spalletti praised Rosina for his footballing attitude and determination to fight for a place in the team, promising him a squad role for the remainder of the season.