Butler posted his message to fans in Chicago and the Bulls organization on Instagram:
The Bulls selected Butler 30th overall in the 2011 draft. After averaging just 8.5 minutes in 42 games as a rookie during the lockout-shortened 2011-12 season, he became a key piece of the rotation the following year before becoming a full-time starter in his third season.
Butler has led the Bulls in scoring and win shares, including a career-best 13.8 in 2016-17, in each of the previous three seasons.
The trade to Minnesota reunites Butler with head coach Tom Thibodeau, who coached the Bulls from 2010 to 2015 and was part of the staff that drafted Butler out of Marquette.