Jaren Jackson has announced he will declare for the 2018 NBA Draft.

Jackson is widely expected to be a top-5 pick.

"[T]his was not an automatic decision," Jackson said in a note to Spartans fans that he shared Monday via social media. "And honestly, thank you for making it one of the toughest decisions I've ever had to think about."

Tom Izzo said in a statement that he was looking forward to Jackson's move to the NBA.

"He was a tremendous talent when he first stepped on campus, but when I think about the way he's improved so much in just one year, especially defensively and with the ball, the sky's the limit on what he can accomplish," Izzo said. "There's no question he could be one of the first few players selected in the draft."