Lyon president Jean-Michel Aulas is confident the club's new stadium will be a safe place during Euro 2016 but has cast doubt on how fan zones can be secured.
Tuesday's terror attacks across the Belgian border in Brussels have put a renewed focus on how France will handle security at this summer's European Championship.
UEFA executive committee vice-president Giancarlo Abete admitted this week that there was a risk that games would have to be played behind closed doors as a result of the terror threat.
Aulas, however, believes that the Parc Olympique Lyonnais, which was inaugurated in January and will host Belgium vs. Italy, Ukraine vs. Northern Ireland and Hungary vs. Portugal in the group stages, will be a safe place for visiting fans to watch matches this summer.
The Lyon chief was less certain about proposed fan zones -- where supporters will be able to watch matches on big screens in each of the tournament's 10 host cities.
Asked about safety at the Parc Olympique Lyonnais, he told reporters: "No, I don't think there are any worries there. We've made so much investment in security.
"In my opinion, this subject of safety will instead be in the fan zones. In these areas, it will be a lot more difficult to check everything."
However, Aulas indicated that it was vital for everyone involved in Euro 2016 to demonstrate that normal life can go on.
"We have a mission -- to show those that want to create drama and tragedy that we can continue, in 2016, to bring football and performances to life in a stadium like this one.
"It's also a social role to make the investments needed so that spectators will be safe and they will be in Lyon."