Skysports.com can reveal that midfielder Sunny is in negotiations with Portsmouth and is set to join the South Coast club on loan.
Osasuna confirmed earlier this week that the 20-year-old had been granted permission to travel to England and negotiate a possible move to an unnamed side.
Sunny signed a season-long loan agreement with Osasuna in the summer and is set to return to Valencia at the end of the campaign.
However, Osasuna are willing to let Sunny discuss a potential switch to the Premier League for the rest of the season.
Pompey are looking to strengthen their squad before the close of the transfer window and are interested in bringing in Sunny.
The Spain Under 20 international is having a medical with Portsmouth and is understood to be close to agreeing a move.
Sunny is discussing a loan deal until the end of the current campaign with a view to a permanent transfer.