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The 21-year-old said in April that he'd test the draft waters while maintaining his NCAA eligibility.
The 6-foot-11, 260-pounder won Big Ten Player of the Year honors this past season after averaging 23.9 points, 9.8 rebounds, and 1.8 blocks for the Hawkeyes. He was also a Wooden Award finalist.
The draft stock of traditional big men has plummeted in recent years, and Garza was projected as a second-round pick or undrafted free agent. However, he improved his stretch shooting as a junior, hitting 35.8% of his 3-pointers while averaging 3.5 attempts per game.