The strapping 1.92m ex-Stoke and West Ham striker, who has scored 34 times in 108 caps for Austria, is joining on a €10 million deal, sources said.
The player will get €3.7 million plus bonuses.
Meanwhile, unsettled Belgium striker – and Juventus target – Romelu Lukaku may be set to leave Chelsea for inner London fellow club Spurs, who have just sold England captain Harry Kane to Bayern Munich for €116 million.
In other Serie A transfer news, AS Roma are set to sign Portugal midfielder Renato Sanches and Argentina midfielder Leandro Paredes from French giants PSG, Giallorossi sources said on Monday.
Sanches is poised to come on a loan with a buy option, they said, while Paredes will be bought outright for €2.5 million plus bonuses.
Roma’s Argentina forward Paulo Dybala, who was part of the World Cup winning team with Paredes, was said to be key in the latter’s move.
The two latest additions to Roma’s squad will arrive at the Trigoria training camp by Wednesday, the sources said.
ANSA