The Dane agreed a reduced salary when he signed his latest deal in return for a bonus every time he plays.
But Sorensen, 34, was left out of pocket last season after losing his starting place to Asmir Begovic.
Sorensen said: "When I signed my latest contract it was from the perspective that I was the starting keeper.
"We agreed my salary with a bonus based on performances. I'm not interested in a reduced salary. All I hope for is dialogue."