The Scottish Premiership leaders missed out on a place in the final.
The Norwegian's decision to leave the club came just days after the Hoops were knocked out of the competition following a penalty shootout against their Old Firm rivals. But Deila has claimed that his team coming out on top during the spot-kicks would have probably not had an impact on his future.
"No, I don't think so. Because even if we had beaten Rangers, I wasn't happy with the performance," he told the Record when asked whether a different result would have seen him stay on.
"It wasn't only that performance. It has been overall for a while now. There hasn't been that energy I need from my teams. So that has nothing to do with the Rangers game.
"Of course, it was a hard blow but it was not the final thing."
While a victory over their bitter rivals would have given the Bhoys supporters something to cheer about, many of those who wished for the club to appoint a new manager would have pointed to the fact that Deila's men were unable to complete the game inside 90, and then 120 minutes.
And with their opponents returning to the Scottish Premiership next season, Celtic would surely have been hoping to drain all the optimism that exists at Ibrox currently by romping to an emphatic victory that would have struck a major psychological blow ahead of the next campaign.
But with penalties required to separate the two sides, it was quite obvious that Deila was going to emerge from the game with little credit. And with the result then going against them, the announcement that came just a few days later confirmed what had arguably become inevitable.