Tamas Priskin's goal gave the Championship side a shock 1-0 win at Portman Road on Wednesday night against a strong Gunners side.
Arsene Wenger's men remain favourites to win through to a Wembley final but Delaney is just grateful to have something to hold on to ahead of the second leg.
Solid: Delaney (left) puts in a strong challenge on Arsenal captain Cesc Fabregas
He said: 'Arsenal weren't at their best, but in the tie, we have to be above our best and pray to God that they are somewhere below average if we're going to get close to them. That's what happened.
'We'll go and park the bus in front of the goal at the Emirates, like Jose Mourinho said.
'We've got something to hold on to. They'll be breaking out all the big guns to do well after not winning any trophies for so long. When you've got something to hold on to, you can get another huge performance out of you.'
Ipswich were hammered 7-0 by Chelsea in the FA Cup last Sunday but put in a disciplined performance under caretaker manager Ian McParland to shock the toothless Gunners.
New manager Paul Jewell took charge on Thursday morning and Delaney has now turned his attention toward improving performances in the league after a poor run of form under Roy Keane.
Cup cracker: Priskin celebrates scoring the only goal of the game against Arsenal
He said: 'It wasn't an incentive with the new manager there. Sunday was the biggest incentive.
'No professional team should be turned over seven by anyone, be it Chelsea or anyone. As a group, we didn't put in a performance on Sunday.
'We wanted to make sure the second leg was a meaningful tie. It might have been a cricket score down there if we didn't, but we've got something to hold onto now.
'It was sad to see Roy go. He was honest, the manager. His heart was in the right place, but it didn't work out. You can't fault anyone when your heart's in the right place.
'The team didn't get the results that were required. You move on. If you look at all the performances under Roy, the effort was always there. We always ran around and tried to do the best we could, but we didn't get the results we were looking for.
'Against Arsenal we were able to marry up the result and the performance and that must continue now.'
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