Cattermole hurt his back in a challenge during the game against Chelsea while Cana damaged a hand.
Bruce said: "Lorik Cana has got X-rays in the morning. He's got a bang on his hand and it could be broken. We hope not."
It's one of the most exciting nights of the football calendar as the FA Cup 3rd Round draw is taking place at around 1915 on Monday evening.
Premier League and Championship sides will be paying close attention to BBC Two on Monday night as the two top
Manchester City host Celtic in their final Champions League Group C game on Tuesday.
Leicester manager Claudio Ranieri admitted on Saturday that everything is wrong with the Premier League champions' defence of their title
The latest gossip and rumours from the newspapers and online:Arsenal target JULIAN DRAXLER has reiterated his wish to leave Wolfsburg
The title-race heat went up a notch as Chelsea made their mark, Arsenal continued to put the pressure on the