Hartson backs the Germany ace to have a big Euros.
He wrote in the Scottish Sun: "He is a class act. Clever, quick and a top finisher with that sweet left foot.
"Give him an opening and he'll bury it. No messing about. He rarely misses the target from any distance.
"The lad will be buzzing too. Arsenal have just shelled out £10million to buy him and now he's off to the Euros.
"He currently has 43 goals for Germany. I fancy him to add another five or six to that over the next month."