The 28 year old has received a lot of interest from English clubs with rivals West Ham being one. Blackwell has told the Sheffield Star that "the figures quoted are way beyond us."
Blackwell said: "I keep hearing all of these names being banded about but, to be honest, I've never even heard of half of them.
"I know about the lad from Italy (Bresciano), but the figures being quoted are way beyond us."