The former Gloucester forward has made 42 European appearances in his career and was named in Italy's World Cup squad earlier this month by national coach Nick Mallet.
His absence with the national side means Aironi head coach Rowland Phillips has chosen hooker Roberto Santamaria to lead the team for the first part of the season.
"I have choosen Marco because of his great experience as a captain at the highest level (a record 37 times as the Italian Captain). He led the team several times during last season, he knows how to face the pressure a team will face during a RaboDirect PRO12 and Heineken Cup campaign - he is a natural captain" says Phillips
"Quintin did a great job for Aironi during a very tough first season, we had a great relationship that of course will continue during next season. But I want him to focus on his rugby.
"During the World Cup period Roberto Santamaria will captain the team. I need someone who has captaincy experience, someone who is positive and is respected by the team. Roberto ticks all these boxes, he's a hard worker, he wants to improve day after day and he is an example for his teammates. I'm sure he will do a great job".