The seventh season - made up of seven episodes instead of the usual 10 - is expected in summer next year, while the final season will be in 2018.
Game of Thrones is based on novels written by George R R Martin.
Now the programme has overtaken the source material, meaning producers are telling a story no-one has read before.
Spin-off `possible`
Speaking on Saturday in Beverly Hills, California, Mr Bloys said the number of episodes for the final season was yet to be determined.
"We`ll take as many as the (producers) will give us," he said.
Mr Bloys did not rule out a spin-off, saying that "we`re open to it, (the producers) aren`t opposed to it, but there`s no concrete plans right now".
Last year, Game of Thrones won a record 12 Emmy Awards for a series in a single year.
The series has picked up 23 nominations - another record - ahead of this year`s annual ceremony to be held in September.
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