Major League Baseball still faces an uncertain U.S. economy that led to lower attendance and financial losses at some clubs this year, the commissioner of the U.S. sports league said on Thursday.

"I've said this all year and I'll say it again, we're living in the most difficult economic environment since the Great Depression," Bud Selig said to reporters at a meeting of owners in a hotel here.

"We don't live in a bubble," he said, acknowledging that some clubs he would not identify lost money this season.

Read more: Baseball still faces tough economy: commissioner | Reuters