Gary Payton II has failed a physical exam that could put a four-team trade agreed to before Thursday's deadline in jeopardy, according to Shams Charania and Anthony Slater of The Athletic.
An exam by the Golden State Warriors staff determined Payton could miss up to three months with a core muscle injury.
The guard spent the first half of the season with the Portland Trail Blazers, but the latest trade would have brought him back to Golden State after spending the previous two years with the team.
Sources told Charania and Slater that Payton "had been playing through pain in Portland" and "added that the Blazers training staff had been pushing him to gut through it, giving him Toradol shots.