Bendtner's arrival has been criticised by many local pundits.
But Vialli insists: "I think Juventus did well strategically. After understanding that it was impossible to sign a great champion, they were wise in not spending crazy money for a player who would not arrive with the guarantee that the side would take a step up in level.
"I believe that Bendtner can do well if he doesn't try to be better than what he is. Every now and again he'll look to do something special, but that is not his job. He should leave that to Mirko Vucinic.
"He should concentrate on his physical ability as a penalty box striker. He can score a lot of goals that way."