Major League Baseball commissioner Rob Manfred is considering making the big leagues even bigger.

While taking questions at Monday's FanFest, Manfred discussed the idea of possible expansion in the league's future. He mentioned three cities that could someday find themselves with an MLB franchise.

"I know the Mayor of Montreal has been very vocal about bringing baseball back to Montreal," Manfred said via MLB.com. "Charlotte's a possibility. And I'd like to think that Mexico City or some other place in Mexico would be a possibility."

Montreal makes sense as it was once the home of the Expos for 35 years from 1969-2004. The franchise was moved to Washington, D.C., and renamed the Nationals in 2005.

While Mexico City seems like a random choice, it could actually make sense for the league on a few levels. MLB has an office in Mexico City, exhibition games have been played there before and it would be an opportunity for the league to grow in another country.

Charlotte has shown it can support a professional sports team, since it's the home of the Carolina Panthers and Charlotte Hornets.