AC Milan shocked Barcelona with a clinical performance which saw Kevin-Prince Boateng and Sulley Muntari grab two second-half goals despite having only 34% of the possession throughout the game. A solid defensive perfomance also ensured that Massimiliano Allegri's men managed to restrict the Catalans to only two attempts on goal while the Rossoneri mustered six shots on target.
However, Roura felt that his side deserved more from the tie despite performing below their best and also voiced his siatisfaction at the condition of the San Siro pitch.
"This wasn't our best game. Although we had problems I think that the result is undeserved," he told Uefa's official website after the game, "They made a couple of opportunities and scored from them which now makes things tricky for us.
"We had previously said how difficult it is to come here. Milan were very well-organised at the back and they defended well. We found it very hard to get in behind them.They played with a lot of men in defence and it's true to say their first goal shocked us a little."
"The first goal hurt us, we lost our focus and perhaps we were too overeage," he added on Barcelona's official website, "The pitch was a potato field. It was improper for a match of this nature."
The result leaves Barcelona with a mountain to climb in the second leg but Roura is confident of bouncing back in the second leg at Camp Nou.
He added: "We are confident in our own team and playing at our own stadium. It will be a different story in the second leg and we fully believe we can turn this around."
Barcelona midfielder Pedro Rodriguez also backed his side to make up for it in the second leg.
He said: "It was a bad game from our point of view. It was very hard for us to get into the match. They scored twice and we couldn't respond.
"We tried to play our normal style but we were missing something. We are leaving feeling very down but they deserved their win. Now it's up to us to respond."
The second leg of the Champions League last-16 tie between AC Milan and Barcelona will take place in three weeks time.