The incident happened on a flight to Philadelphia.
Cheeks was waiting on test results and "doing well" Thursday, according to a team official. The official said the team won't release any more information until Cheeks' test results are known.
Cheeks, who played 15 NBA seasons, is a beloved former player in Philadelphia after being part of the 76ers' 1983 NBA title team. He was a four-time All-Star during his 11 seasons with the 76ers from 1978-89.
He was nominated for induction into the Naismith Basketball Hall of Fame in December.