Gary Payton II will be out for at least a month due to an injured abdomen, according to Bob Myers.
The Warriors hope to have Payton in time for the playoffs.
The Warriors approved the trade for Payton on Sunday after the guard initially failed a physical, with the team believing that the Blazers withheld medical information during the process of the trade.
The Warriors asked the league to investigate the failure to provide medical information.
The NBA could punish the Blazers with a fine or a loss of draft picks.
“What do I want [from the investigation process]? Whatever the NBA says is fair. I just want a fair result,” said Myers on Monday.