Minnesota Timberwolves All-Star Jimmy Butler went down to what appears to be a serious knee injury late in the third quarter of Friday’s game against the Houston Rockets.

The injury itself doesn’t look good, as Butler was not able to put any weight on the knee in question. He immediately exited the court and went into the X-ray room for further evaluation.

Following the game, Wolves head coach Tom Thibodeau noted that Butler would indeed undergo an MRI when the team returns to Minnesota. The mood in the Wolves’ locker room was also said to be “somber.”