The midfielder was given a rare start in tonight's 1-1 draw with Fiorentina, but lost the ball repeatedly and did very little going forward.
His lack of pace was a particular issue and there was a moment just before half-time when he was dispossessed and failed to track back.
Bergomi barked: “Joao Mario has been just embarrassing. What I saw just now I never want to see again from any player, let alone one in an Inter shirt.
“He lost the ball and jogged back, he didn't even try to speed up. All he ever does is pass backwards with no sense of impetus, nor of potential danger."
Mediaset Premium commentators weren't much kinder to Joao Mario, as the vote for his performance was “five out of 10 and that's just for being a nice guy."