McMillian agreed to a training-camp contract with the Warriors on Tuesday, Paul Garcia of The Spot Up Shot reports.
McMillian is set to compete for a spot on Golden State's regular-season roster in training camp. He appeared in 31 outings with the G League's Santa Cruz Warriors in 2025-26, averaging 16.6 points, 4.9 assists, 4.2 rebounds and 0.8 steals across 29.9 minutes per showing.