Major League Baseball commissioner Rob Manfred shared a vision of the game Tuesday that could ultimately include more than 30 franchises.

Manfred, appearing at a Baseball Writers Association of America luncheon at the All-Star Game in Cincinnati, said he's open-minded about the possibility of MLB expanding for the first time since the Arizona Diamondbacks and Tampa Bay Rays came on board in 1998.

"Maybe one of the reasons I got this job is, I'm bullish on this game," Manfred said. "I think we are a growth business, broadly defined. And over an extended period of time, growth businesses look to get bigger. So yeah, I'm open to the idea that there will be a point in time where expansion may be possible."

Manfred said MLB has compiled a list of cities that might be viable options through expansion or possible relocation from existing markets. Tampa Bay and Oakland have been mentioned as markets that could eventually risk losing their teams if their ongoing stadium issues are not resolved.

Montreal, Charlotte, North Carolina, San Antonio, Portland, Oregon, Las Vegas, Oklahoma City, northern New Jersey, Mexico City or Monterrey, Mexico, are among the markets that could eventually land on baseball's radar as potential locations for new franchises.

Montreal, in particular, has been vocal in its desire to land a team. The city's mayor, Denis Coderre, met with Manfred in New York in late May to begin a dialogue on the subject. Montreal showed its fervor for baseball by attracting 96,000 fans for two exhibition games between the Toronto Blue Jays and Cincinnati Reds in March. But Manfred has publicly stated that the city needs to build a new facility to replace Olympic Stadium, home of the Montreal Expos from 1977 through 2004.