"A few details remain in the writing of the contract, but it should be ready in a couple of weeks," a statement on the club's website said.
Larsson, who played for Feyenoord, Celtic and Barcelona before returning to his home club in 2006, won his 102nd Sweden cap in November in a 3-1 friendly loss to the Netherlands.
The Swede, who turns 38 this year, had a brief spell on loan with Manchester United in 2007 having joined Helsingborg after the 2006 World Cup.
The Swedish League begins on April 4.
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