The defender, who was frozen out of the squad under the Italian, says successor Gus Poyet has rejuvenated the club and is now hopeful of avoiding relegation from the Premier League
The Italian's short stint was brought to an end in September following a 3-0 defeat to West Brom that left the club with just one point from their opening five Premier League fixtures.
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Bardsley - who had been frozen out under Di Canio - credits the upturn in fortune to Poyet, and is confident of beating the drop with the Uruguayan at the helm.
"You've got to have a very good team spirit. I think that was beyond dead six months ago," he told The Shields Gazette.
"Now we've dug it out. The manager came in and gave the players a new lease of life and everyone is taking their opportunity. That's what you need week in, week out, because there's decent competition at the club.
"When I came in, the team only had one point, but now we're on the way to getting out of it."
On the club's survival hopes, he added: "We believe we can do it. We're in our own mini-league and if we win on Saturday against Southampton, we're three points behind Hull in 10th.
"That's unbelievable when you look back three or four weeks ago. We need to just focus on ourselves and win as many games as possible."