Deng remained in Chicago after sitting out Thursday's Game 6 against the Nets and did not accompany the team to New York for Game 7.
The Chicago Tribune said Deng developed complications after undergoing a spinal tap this week.
Deng averaged 13.8 points, 7.6 rebounds and 3.8 assists in the first five games of the Eastern Conference quarterfinals series against the Nets.
Boston schools pull out free condoms over wrapping complaints
Millions of Getty images now available for free via embed tool