Jonas Portin

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. Co-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; co-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 life-threatening 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 2011–12 financial year, not fully but from…

Portin was also a member of Finland national under-21 football team.

As of 1 September 2024.

His older brother Jens is also a professional footballer, previously representing Gefle IF in Sweden.