However, after failing to hit the net in the first leg's scoreless draw in Zenica on Friday, the 42-year-old old admits the decider in Lisbon could be a risky affair.
"It will be very tight, but we're convinced we will go on and take control of the match," Bento told reporters on Monday. "We still have a 50 per cent chance of going to the EURO. It's a good result, but it's still leaves us in a risky position as we didn't score an away goal."
Portugal famously ended Bosnia's hopes of going to their first FIFA World Cup™, last year in South Africa, after prevailing 1-0 in each of two play-off games. A Bosnia goal in Lisbon on Tuesday night, however, would heap pressure on the hosts and force them to score twice to have any chance of securing their ticket to the EURO 2012 in Poland and Ukraine next year.
Bento warned: "We'll be playing a team which has all-round technical ability and possesses a number of fine individual players." But he believes Portugal will ultimately prevail. "At the end of these 90 minutes we will be a happy team and, more importantly, a happy country."
Ahead of the three other second-leg playoffs Croatia lead Turkey 3-0, Czech Republic lead Montenegro 2-0 and Republic of Ireland lead Estonia 4-0.