The Black Cats were held to a 1-1 draw by fellow strugglers Southampton at the Stadium of Light on Saturday, leaving them just four points ahead of 18th-placed Wigan and the dreaded drop zone.
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"Let's be sure we can keep the club up, and then I change everything,” Di Canio told reporters.
"I will keep the right players. Bring in the right players. This is not a secret. There will be many changes. It is crucial to have the right quality.
"When I came I knew the quality we had, Adam Johnson, John O'Shea etc. But not to accuse anyone, the environment was DEAD. It was dead.
"There is not a bond. The team is not close together. Good fellas, but everyone in little groups. But when we stay up I can tell you that it is a miracle."
Sunderland took the lead against Southampton but were pegged back by Jason Puncheon's 76th-minute equaliser, but Di Canio believes a point could prove to be enough in the Black Cats' pursuit of survival.
Di Canio added: "This is small important step. It could be crucial at the end of the season. We've got eight points in six games. The players have made a miracle to get this. With attitude, discipline.
“Before I arrived if they had said will you sign up for 8 points in six games, I'd say yes. It is a massive number of points. They did a fantastic job."