Singler signed a contract with Obradoiro of the Spanish Liga ACB, EuroHoops.net reports.
Singler has been waived by Oklahoma City through the stretch provision, Adrian Wojnarowski of ESPN reports.
Singler is inactive for Saturday's game against the Jazz, Erik Horne of The Oklahoman reports.
Singler is inactive for Thursday's season opener against the Knicks, Brett Dawson of The Oklahoman reports.
Singler averaged 23.8 minutes over five games this preseason.
Singler started at small forward and scored a season-high 11 points (4-12 FG, 1-4 3Pt, 2-2 FT) to go with four rebounds across 28 minutes in a 100-98 win over the Timberwolves on Tuesday.
Singler will start at small forward for Tuesday's tilt with the Timberwolves, Erik Horne of The Oklahoman reports.
Singler supplied six points (2-3 FG, 2-3 FT), three rebounds, one assist, one steal and one block across 17 minutes in a 120-98 loss to the Wizards on Monday.
Singler played 16 minutes in a 107-91 loss to the Cavaliers on Sunday, finishing with two points (1-5 FG, 0-2 3Pt) and two rebounds.
Singler finished with five points (2-4 FG, 1-2 3Pt) and two rebounds across 17 minutes in Wednesday's 121-100 loss against the Warriors.