The Austria U17 youth international is yet to feature for the Rovers first team but made nine appearances for the reserves but now could be on the move.
Vastic, who plays mainly as a striker, said the move was close whilst his agent, Sascha Empacher, insists that the deal looks likely.
"There are only formalities to clarify," the 18-year old told Sportnet.At.
Empacher added: "The transfer is fairly certain, though still not 100 per cent settled. We are still waiting for Blackburn Rovers to agree to release him."