Real Madrid defender Sergio Ramos has raised further question marks over his future after a coy response concerning interest from Manchester United.
Millwall have signed defender Tony Craig on a two-year deal.
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."