The All-Star forward's return to the team included "verbally challenging teammates, coaches and front office executives" and a scrimmage in which Butler led third-stringers against the team's starters, according to ESPN.
Butler requested a trade before the start of training camp but the Wolves have been unable to find a trade to their satisfaction. Since then, he hadn't reported to Wolves practice or participated in preseason games until Wednesday.
Butler's preferred trade destination is the Miami Heat, but talks between the two sides have broken down.
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With that in mind, the Heat appear to still be in pursuit. According to ESPN's Stefano Fusaro, the Timberwolves reportedly asked for Tucker and shooting guard Eric Gordon in a trade involving the 29-year old guard.
It's not clear what Butler's outburst means for Minnesota.
Minnesota's front office stood firm in their desire to keep Butler and reportedly shut down inquires from opposing teams, per Wojnarowski.
What did they expect, Butler to come in and play nice? The Heat remain the lone legitimate suitor for Butler as of Wednesday afternoon as the Timberwolves have reportedly "had no serious, active talks with any other team".