Todd Mayo, the brother of O.J. Mayo, plans to leave Marquette University before his upcoming senior season and pursue professional basketball in the NBA Development League or overseas, sources with direct knowledge of his decision told RealGM on Wednesday.

Mayo confirmed his choice to leave Marquette, and he told RealGM that he expects to sign in the D-League and place his name in the 2015 NBA Draft.

“I’m looking forward to the D-League and just learning and getting better,” Mayo said by phone on Wednesday afternoon.

In his junior season, Mayo was Marquette’s third-leading scorer at 11.3 points per game while shooting 46.1 percent from the field. The 6-foot-3 guard played 30 games a season ago and was expected to emerge as a starter in 2014-15.

Mayo, 23, has received support from his family and the university in deciding to leave school. Marquette officials are expected to make an official announcement within the coming days.

Todd and O.J. Mayo reunited in Milwaukee last season, when O.J. averaged 11.7 points and 2.3 rebounds in his first year with the Bucks.