Former Torino boss Ventura has had to answer many questions following the abject display against Macedonia, but Buffon claims that it is wrong to single him out for abuse.
"The boss has gone down the route of bringing through young players, the only one possible," he told reporters. "And for a year there have been good results.
"It needs gradual progression. When you go through difficult moments at your club, you can also lose confidence playing in the national team. All of these things can be decisive when it comes to certain young boys.
"I don't think the attacks on the boss are correct. For a year, he was the right man and two matches can't ruin everything."
Italy travel to Albania in their final Group G outing on Monday night, with a playoff place already assured.