Michigan sophomore power forward Mitch McGary decided to declare for the NBA draft Friday after facing a year-long NCAA ban for testing positive for marijuana.

"Being a part of a program that values integrity, it is important to let everyone know of a poor decision I recently made," McGary said in a statement released by Michigan. "I tested positive for marijuana during the NCAA Tournament. We were notified of that result after the Final Four.

"I regret thoroughly disappointing my family, coaches and administration. Despite all of this they have been understanding and helpful over the last couple of weeks. I take full responsibility for this poor choice and want to apologize to everyone, especially those I have grown close to during my fabulous two years at the University of Michigan."

McGary, who is 6-foot-10, played just eight games (four stars) this season because of a back injury that ended his season in mid-December. He averaged 9.5 points and 8.3 rebounds per game. In 2012-13, he averaged 7.5 points and 6.3 rebounds in 39 games, including eight starts.

Yahoo Sports reported that McGary failed a drug test administered by the NCAA after the Wolverines' win over Tennessee in the regional semifinals of the NCAA Tournament. McGary suited up for that game but did not intend on playing due to the injury.

McGary told Yahoo Sports that he smoked marijuana one night in mid-March.

NCAA rules for drug testing supersede those of individual schools.

"It's just with the NCAA and their strict rules, they don't show any mercy," McGary said. "They take their things seriously."

After helping the Wolverines reach the NCCA title game against Louisville in 2013, McGary decided to return to school. Because of his back issues, he could be a second-round pick, several NBA scouts told ESPN.com.