AC Milan striker Zlatan Ibrahimovic is confident his team can qualify for the semi-finals of the UEFA Champions League at the expense of Spanish heavyweights Barcelona. I Rossoneri held the reigning European champions to a goalless draw in last night\'s quarter-final first leg, and head to the Camp Nou next Tuesday for the return with a realistic chance of causing an upset. \"I am optimistic,\" Ibrahimovic told Gazzetta dello Sport. \"We have already played in Barcelona and we know what to expect. \"Everyone knows Barcelona have more possession than any other side in the world so we did well and created quite a few scoring opportunities. The goalless draw is a good result and keeps our option open. Now we will see what happens in Barcelona.\" Veteran Milan midfielder Clarence Seedorf believes an away-goals victory is well within the capabilities of the Italian outfit in the return leg. \"They will have to play for a win while we will have several results at our disposal,\" Seedorf said. \"Every side has a weak spot and we can definitely bring home a draw. I believe we can get through and I respect Barcelona.\" Antonini: \'We needed more in attack\' Milan defender Luca Antonini, who was voted UEFA\'s man of the match against Barcelona yesterday, rued his team\'s missed chances. Robinho spurned the best chance early on as he skied his shot from close range over the crossbar when it looked a certain goal, while Ibrahimovic also wasted a first-half opportunity when put clean through on goal. \"We had clear chances, allowing Barcelona something, but we played a good game,\" Antonini said. \"I think we could have done a bit more in attack and especially in the first half we created the opportunities.