Michael Sam -- Leaves CFL Training Camp ... Cites Personal Reasons

Mystery surrounding Michael Sam ... as the Canadian Football League player has left training camp for personal reasons the day before his team's first exhibition game.

Sam -- who signed with the Montreal Alouettes back in May -- asked the team for "special permission" to leave the camp and return home.

The team issued a statement saying, "With all due respect for Michael Sam, the nature of this decision will remain confidential."

"The Montreal Alouettes fully respect Michael Sam's decision and rally around him to offer him all time and support needed. The team has left the door open and Michael is welcome to come back whenever he feels ready."