Career
Portin had represented Ascoli and Padova of Serie B, the second-tier league of football in Italy. Jaro
Portin started his senior career in Veikkausliiga team FF Jaro. He made his debut at the senior level in 2005 with FF Jaro.
In 2006 he became a regular player in Jaro´s starting eleven.
Ascoli
In 2009 he transferred to Serie B club Ascoli. Padova
On 31 August 2010 he was transferred from Ascoli to Padova for €900,000 in co-ownership deal in 3-year contract.
Company-currently Ascoli signed Vasco Faísca for free. and Marc Lewandowski in temporary deal. In August 2011 Padova acquired Portin outright for €450,000.
Gianluca Giovannini also moved to Ascoli for free.
Parma and retirement
In June 2012, days before the closing of the financial year of Parma on 30 June (Padova ended the financial year on 31 December), Parma signed Portin in co-ownership deal for a nominal account value of €2 million, in 3-year contract. Company-currently Padova signed Niccolò Galli also in co-ownership deal for €2 million, thus a pure player exchange deal. The deal boosted both club financially as well as benefit in the field
Portin immediately returned to Padova in temporary deal.
However Portin was forced to retire from playing football on 3 August 2012 following the discovery of a rare heart defect which could have been lifethreatening if he continued to play. Portin´s team honoured him on 25 August 2012 by displaying his shirt after a goal against Lanciano.
Parma write-down the accounting value of Portin backdated to 2011-2012 financial year, not fully but from €4 million to €2.667 million. Despite Portin was retired, along with Galli, the two co-ownership deals were renewed technically on 20 June 2013.
On 30 June 2013 Portin finally released by Parma, which the club had to write down €1,777,778 on 30 June 2013 as well as bore an amortization cost of €888,889 in 2012-2013 financial year.
However it also counter-weight by the financial income of €2 million as Parma did not have to pay for the remain 50% registration rights.