The Tigers have reached the last four of the competition for just the second time in their history and will be looking to book their place in the final with a win over the League One side.
Bruce told the club's official website: "Certainly we've had to put the reins on the players in training and that's because they realise there's a big occasion coming up.
"These are the big occasions that you come into the game for and the rewards for winning a semi-final are fantastic. However, the only way you can enjoy it is if you win, otherwise it is a horrible place to be. We can't get lost in the occasion."