Antonio di Natale struck the only goal of the game.
"Of course there is disappointment, we can never be happy after a defeat, especially an avoidable one," said the Coach on Sky Sport Italia.
"I asked straight after the game for the team to focus on the next target, as if we dwell too much on this performance it will sap confidence ahead of next week's Champions League game.
"I told the players to keep believing, as there were 20 minutes after the goal. They gave what they could and clearly there was a lack of freshness in some players who were on international duty midweek.
"We weren't determined enough in front of goal and today encountered a good goalkeeper. We knew Udinese's strength is pouncing on errors and going on the counter, so we should've made better choices in our passing and not tried to go through the middle.
"On the goal it was an impressive move and you could also see our legs were tired compared to theirs."
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