So long, Sorensen - analysis
Elias Sorensen arrived in the summer with Pompey still reeling from the news that Colby Bishop required heart surgery.
The Dane had a memorable debut scoring away at Leeds United but hasn't found the net since.
His game time became minimal in the past couple of months and he struggled to impact Championship matches.
It's also understood there were personal challenges moving to England.
Pompey will be pleased to recoup the fee they paid for him.
As he'd already appeared for Danish side Esbjerg this campaign he couldn't sign for a third club this season due to FIFA rules.
However, because the Norwegian season runs from March to November he will be able to appear for Valerenga when their campaign gets underway.