The second-leg finished 0-0, so allowing Spurs to progress courtesy of their 1-0 first-leg victory.
"It is tough to go out like this after dominating the game and doing so well," said 'The Duck.'
"What we needed was a goal and we didn't get it. We played well, but without the scoreline, it's all irrelevant in the end.
"Now we must quickly forget this game and focus only on Serie A and the Coppa Italia. We all want to win and can do so in Italy this season."