United came from a goal down to win their Champions League clash 2-1 in Turin.
"(Marouane) Fellaini gave us the chance to be alive again," said Mourinho.
"He gave us the opportunity to create opportunities like the ones we created.
"With the change of (Andrea) Barzagli for (Juan) Cuadrado, their counterattack was less dangerous and we created opportunities. I do not even know who scored the own goal, I know we won."