"It's a big squad and you'll see tomorrow night that a lad might be involved who wasn't even in the 18 on Saturday"
Paul Cook said Town must carry optimism from the training ground on to the pitch when Lincoln City visit Portman Road tomorrow night.
Blues fell to defeat away to Gillingham on Saturday, but had won their previous three outings before the game at MEMS Priestfield Stadium at the weekend.
"It's a big squad and you'll see tomorrow night that a lad might be involved who wasn't even in the 18 on Saturday," the Blues boss said.
“That's why as a manager you want the lads to work hard on the training ground. You've got to be prepared so that when your opportunity comes, you're fit and ready to take it.
“We've got 15 games to go and we've got so much to play for.
“The optimism and energy at the training ground needs to be transmitted on to the pitch. We didn't see that on Saturday, and that was the disappointing thing for us.
"The main thing I want to see is an improved performance."