ROME, April 18 (Reuters) - AS Roma beat AC Milan 2-1 on Thursday to complete a 3-1 aggregate win and set up a semi-final showdown with Bundesliga champions Bayer Leverkusen in the Europa League.

Defender Gianluca Mancini gave Roma the lead in the 12th minute of the quarter-final second leg, scoring on a rebound from close range.

Paulo Dybala doubled the advantage for the hosts 10 minutes later with a curled shot inside the far post before Matteo Gabbia pulled one back for Milan five minutes from time, nodding home a cross from forward Rafael Leao.

Roma lost striker Romelu Lukaku to an injury in the 28th minute before they were left with 10 men in the 31st when defender Zeki Celik was sent off for a challenge on Leao.