The practice comes after sources said that the Heat were still pressing for a trade to acquire Butler.
Proposed changes from Minnesota created a breakdown in earlier trade negotiations just as the teams were close to finalizing a deal.
According to one source, Butler and a "team of third-stringers" beat the Wolves' starters in a scrimmage. Timberwolves owner Glen Taylor took a different stance and told owners owners at the National Basketball Association board of governors meetings that "Butler is available, and prospective suitors should contact Taylor himself", according to Wojnarowski.
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"Miami had softened on including guard Josh Richardson in versions of a possible deal for Butler, only to recoil once Minnesota pushed late for a sweeter return on the four-time All-Star forward, league sources said".
The Miami Heat and the Timberwolves were rumored to be interested in a deal involving Butler. These probably aren't the actions teams that have interest in him, either via trade or when he's a free agent next summer, want to see. He averaged 12.9 points in 81 starts last season.
"Outside of the Heat, the Timberwolves have had no serious, active talks with any other team", ESPN reported in a separate story.
Butler was vociferous and emotional at times, targeting president/coach Tom Thibodeau, general manager Scott Layden and teammates Karl-Anthony Towns and Andrew Wiggins, league sources said.
A couple of Butler's teammates were particularly vague when asked about Butler's level of participation in practice on Wednesday.