Deila feels his side have learned a lot in the 12 months since and believes they showed good professionalism as they drew 0-0 in Azerbaijan earlier this month to progress to the final eliminator.
The Norwegian said: “We want to come into the Champions League, that’s the goal. I’ve said that since I came into this club.
“Now we have two games to reach it so we just have to be the best we can be. If we do that but are not successful, we are not good enough.
“I think if we are at our best, it’s going to be tough for Malmo, as well. I know the only thing I can do something with is the performance of the team and I trust my team.
“We have played a lot of games now. I can’t remember the last time we lost a game. The team is in good shape and has a lot of confidence so we’ll see how it is tomorrow against Malmo.”
Mikael Lustig also hopes past frustrations in Europe will drive the squad on to improved performances across the two legs.
The Sweden right-back said: “It’s just unbelievable to have Champions League games at Celtic Park. We’re going to make sure we don’t mess it up this year.
“We’re ready, we’ve been solid in Europe so far. We played really good defensively against Qarabag, our confidence is good now so I think we are ready.
“All the players and the fans want Champions League football. After we went out of the Champions League last year we became a better team.