With 1 year remaining on his contract, around £50m would be a good price selling outside the PL considering he will be free soon. If he had 2+ years left he would be worth more than 100m.I think at this point id be ok with letting him stay and losing him on a free if we think he makes the difference. Based on just one game this year, he can make a huge difference.
If someone can get him for 50 million I feel like thats a huge bargain.
I have read rumors that Perez would prefer getting Eriksen + van de Beek for the same price of a Pogba, so perhaps the Real Madrid’s door is not completely closed.
But as you say it could be worth it to keep him one more year for Tottenham. Or renew him and put a release clause not too crazy so Eriksen can still leave next summer in exchange for a good fee for the Spurs. Let’s say between £50-100m. But it would be risky for Eriksen as it would not guarantee him a way out of England if that’s what he wants