Dorrans has been linked with Arsenal, Manchester City, Everton and West Ham after impressing for West Brom in the Championship this season.
The Baggies have already rejected a £4million bid from West Ham for the 22-year-old.
West Brom chairman Jeremy Peace said: “I want to make it clear again that Graham Dorrans is not for sale.
“As I have stressed several times since we achieved promotion just over two weeks ago our aim now is to retain our core players and try to strengthen the squad.”