Sunderland have made a lacklustre start to the new season, with a draw at Southampton sandwiched by a home defeat against Fulham and a 3-1 loss at promoted Crystal Palace.
Di Canio's approach has prompted reports of unrest at the Stadium of Light, particularly after his public criticism of John O'Shea following the Sunderland captain's red card against Palace.
O'Shea has insisted there has been no falling out with Di Canio, and goalkeeper Westwood also stressed the squad have no issues with the Italian.
"(Di Canio) is like any manager, he wants you to do well," said Westwood in The Journal. "He puts demands on you and he's not going to make it easy for you.
"You've got to play well - if you're a professional footballer you want to play well for your team-mates and your fans anyway. It's not just about the manager. He puts pressures on you but every manager will do the same.
"We're OK, we're a good side. We just need to believe and have trust in each other. That will come - we just need to keep going.
"We've got extra players coming in so we'll see. Thirteen new signings are what we've got but when the players are good enough - as these guys are - you should be able to gel.
"We don't feel like strangers. We spent a lot of time together over the summer and luckily the gaffer managed to get most of his signings in before we went away for pre-season."