Some telling comments from Mancini: Afterwards, Lazio coach Roberto Mancini admitted his side had played their worst match of the season. "We've never been dominated so comprehensively at any time this year," he said. "We went ahead early thanks to a great move. I just don't understand why, after that goal, the team retreated so much. "We gave Porto too much space. That gave them courage. They pushed us back and you see the result. "To get to the final we'll need the crowd behind us (in the return leg). "With a full Olympic Stadium we'll have a slightly better chance of pulling ourselves back into the game".