Duke's Parker and Kansas' Wiggins and Embiid are considered the top three prospects in this year's draft.
Kentucky forward Julius Randle and Australian guard Dante Exum -- both projected high lottery picks -- are expected to attend this year's combine, which will be held Thursday and Friday in Chicago.
Creighton coach Greg McDermott told ESPN.com's Andy Katz that his son Doug, a three-time All-American with the Bluejays, will do physical measurements in Chicago but wasn't sure he would do anything else.
Last year's No. 1 pick, Anthony Bennett, skipped the combine due to a shoulder injury.