Poirier signed a four-year contract with Spanish club Real Madrid on Monday.
Poirier was waived by the Knicks on Sunday.
Poirier is expected to be waived by the Knicks, Adrian Wojnarowski of ESPN reports.
The Knicks acquired Poirier, Terrance Ferguson and a 2021 second-round pick in a three-team trade completed Thursday, Kyle Neubeck of PhillyVoice.com reports. The Thunder will receive Tony Bradley, Austin Rivers and 2025 and 2026 second-round picks in the deal, while the 76ers will acquire George Hill and Ignas Brazdeikis.
Poirier didn't score (0-1 FG) during Monday's win over Indiana.
Poirier (conditioning) didn't play in Friday's 118-94 win over Minnesota.
Poirier (conditioning) is probable for Friday's game at Minnesota.
Poirier (COVID-19 protocols) won't play Monday against the Pistons.
Poirier (COVID-19 protocols) is out Saturday against the Pistons.
Poirier (COVID-19 protocols) won't play Friday against the Celtics.