Wolves' Bakary Sako has revealed he is mulling over offers from the Premier League but is yet to decide on his future.
Rotherham boss Steve Evans will decide the fate of his out-of-contract players in a meeting on Monday.
The 26-year-old has penned a three-year contract at the Parc des Sports after scoring 24 goals across two seasons with the Norwegian club.
He told Evian's official website: "I'm very happy. This is a great opportunity and a fresh start for me.
"I think this is the perfect place for me to play football and for my family to have a good life. I will give everything on the pitch, for my team-mates and for the club. I can't wait to get going."
Nielsen is a full Denmark international and scored his first goal for De Rod-Hvide against Malta in a World Cup qualifying match back in October.