Robbie Rogers of the Los Angeles Galaxy recently said that he expected more gay professional athletes to follow him out of the closet.

The 27-year-old Rogers last year became the MLS' first openly gay player.

The ranks of openly gay professional athletes increased with the coming outs of Jason Collins and Michael Sam. But Collins recently announced his retirement and Sam is currently without a team, leaving Rogers the last man standing.

“To be honest, I thought when I came out and Jason and Michael, I thought there'd be a chain reaction,” Rogers told the AP.

“It's been a lot slower. I guess that just reminds me how big a problem it is in sports culture with homophobia. They don't feel comfortable.”

“There are a number of gay men playing professional sports, just not out,” he added. “In the end, it's really about guys coming out and changing the atmosphere by being in it. You definitely need to create the environment first where guys feel comfortable.”

In Coming Out To Play, released last week by Penguin Books and co-written by Eric Marcus, Rogers chronicles his rise from a “troubled isolated child” to the first openly gay male professional athlete, according to the publisher.