Portugal head coach Paulo Bento lamented that his side were held to a goalless draw by Bosnia and Herzegovina in their first Euro 2012 play-off game.Neither side were able to break the deadlock during the whole 90 minutes, despite Cristiano Ronaldo and Vedad Ibisevic having had good chances to do so in the second half.Bento believes Portugal were the better side and stated that Bosnia only managed to give goalkeeper Rui Patricio a scare once."We had a brilliant first half, in which we had several chances to score," he told RTP Informacao. "On their part, Bosnia created one chance on goal during the whole match."This is an extremely unfair result, considering what we did. I am proud and satisfied with the spirit of the national team, and I owe it to the players."The 42-year-old coach added that the result does not given his side an advantage for the second-leg, which will be played at the Estadio da Luz on Tuesday."We must now keep our feet on the ground," he added. "We have a very complicated match ahead, against a good team, but in a different stadium."We have to play with the same courage, this is a good result, but always dangerous in two-legged ties."