The Blucerchiati shot-stopper was relieved when Super Mario came off during their clash on Saturday...
The 34-year-old rated the young forward a very big threat, and was surprised when the 'Special One' decided to replace him.
"When Balotelli came off the park, I breathed a really big sigh of relief," Castellazzi commented to Novantesimo.it.
"I was surprised that Mourinho substituted him, because Mario is a very dangerous player, so it was very lucky for us.
"I remained awake all night with the amount of adrenaline running through me after the victory."
Rick D'Andrea, Goal.com