The 21-year-old has recently been linked with the likes of Stoke City, Arsenal, Schalke, Stuttgart and Wolfsburg.
Tromso coach Per-Mathias Hoegmo insists he is keen to keep the midfielder, but may have to sell this summer.
“We know that he is followed closely,” Hoegmo told VG.
“I hope we can keep the side until the end of the season. But if there are big sums on the table, it has to be judged.”