Southampton won't accept offers for forward Jay Rodriguez or midfielder Morgan Schneiderlin this summer.
Everton forward Kevin Mirallas has hinted that he will sign a new contract at Goodison Park in the summer.
Centre-back Forren has spent time in Britain already in his career after signing for Southampton in 2013, but he was unable to break into the first team and swiftly headed back to Norway.
Speculation has suggested that he could be a target for Cardiff, who are managed by his former Molde boss Ole Gunnar Solskjaer.
He is not ruling out a move but insists there has been no contact at this stage and he is happy where he is.
"I haven't heard anything serious from Cardiff, but I am ready to listen to offers that come," Forren told VG.
"Otherwise, it is Molde that matters for me."