The Canaries confirmed that the 25-year-old would be moving to Carrow Road after signing a four-year contract yesterday.
Hasan Cetinkaya told Expressen: "It's a step in the right direction for Martin, both football-wise and financially. He joins a club which is investing and with a good atmosphere.
"There was big interest, both in England and other leagues. But Blackburn didn't want to sell in the past."