After spells with Arsenal and West Ham, Nordtveit says he won't ever consider a return to the Premier League.
"We have a house there, maybe during the holidays (we'll visit)," he said.
"But in the Premier League it's over for me.
"I do not understand how some players go through the 60 games and more - year after year. Incredible. We had four games around Christmas and New Year's Eve. Since I already had cramps while warming up. I once carefully asked a colleague if that's just me. He said: 'No, no, that's what the half team do'. But that's the British mentality. That was a great experience."