Karl-Anthony Towns posted a single-word explicit tweet apparently in response to the Minnesota Timberwolves' decision to fire Gersson Rosas.
The Timberwolves parted company with Rosas on Wednesday after just over two years with the NBA team as president of basketball operations.
Reports said Rosas was holding meetings within the organisation as recently as Wednesday morning, meaning his dismissal prompted shock throughout the team – including from two-time All-Star Towns.
Owner Glen Taylor said: "As an organisation, we remain committed to building a winning team that our fans and city can be proud of."
Taylor is in the process of selling the team, with Alex Rodriguez and Marc Lore set to arrive.
The Timberwolves have played only one postseason series since 2004 and showed few signs of progress on the court with Rosas at the helm.
As well as Towns, Minnesota have 2020 first overall pick Anthony Edwards on their roster, but a big front office restructure comes as a surprise as training camp approaches.