Tettey has a contract with Norwich to the summer of 2021.
By that time, he will be 35 years old, and he told Dagbladet: "I don't know how well the body can handle the contract, but in 2021 it's over.
"Then I'm too old. My body can't stand it.
"It's a health decision I've made, and it's fine. I have played in Norway many years before I went abroad, so it does not feel bitter. But I'm thinking of going home to Norway with my family when my contract ends."