The Detroit Pistons have signed forward Derek Willis to a one-year contract.
The 6-foot-9 Willis will be an affiliate player, meaning he'll be at Pistons training camp and then sent to the G League Grand Rapids Drive.
NBA teams must trim their rosters from a maximum of 20 players invited to camp to 15 on opening night. The affiliate player rule allowed teams to retain up to four players they waive. Players designated as affiliate players are automatically assigned to the G League team. They remain available to sign with any other team as a free agent.