The Norway centre-back is yet to feature for the Saints after joining in January but has turned down a move in order to fight for his place ahead of the new season
The 25-year-old, who has seven caps for Norway, only joined the Saints in January for a fee of around £3.5 million but is yet to feature in the Premier League.
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"I am very fond of Molde and hope they do well," Forren told the Daily Echo, "but right now it's not an option for me."
The Norwegian's representative, Jim Solbakken, offered further clarification on the defender's future and why Saints fans are yet to see him play.
"When we took Vegard to Southampton it was obviously in the middle of the [English] season and he came from holiday, so it was agreed he was going to build his fitness towards this summer's pre-season and upcoming season," Solbakken explained.
"It is obviously a huge step for a player coming from Norway to the Premier League and it takes time. He is patient, ready and committed to that. We knew what was coming and we all agreed."