No. 1-ranked high school sophomore Marvin Bagley III ineligible this year

The No. 1 high school sophomore in the country won't be playing basketball this season.

Marvin Bagley III, ranked No. 1 in the 2018 class, was ruled ineligible to compete this season by the Southern Section of the California Interscholastic Federation.

Bagley enrolled at Sierra Canyon School (California) earlier this month after leaving Hillcrest Hoops prep academy in Arizona on Nov. 12.

The CIF's eligibility requirements state that "a student may not be eligible to participate ... if there is evidence the move was athletically motivated or the student enrolled in that school in whole or in part for athletic reasons."

Thom Simmons, director of communications for CIF Southern Section, confirmed the reasoning behind the ineligibility ruling was "athletically motivated transfer" and that he is eligible to play Jan. 4, 2017 -- one year from his date of enrollment at Sierra Canyon.

Sierra Canyon is Bagley's third high school in the past year, as he attended Corona Del Sol (Arizona) for his freshman year before enrolling at Hillcrest Hoops.

The 6-foot-10 Bagley is one of the most prized recruits in the country. Over the weekend, Bagley told ESPN that Kentucky, Duke, Kansas and Arizona were four of the schools coming at him the hardest. Duke's Mike Krzyzewski, Kentucky's John Calipari, North Carolina's Roy Williams and Arizona's Sean Miller all went to watch him during the summer. Bagley also recently took an unofficial visit to Duke.

Bagley was the clear No. 1 in the ESPN.com Future 25, which ranked the top 25 players in high school basketball regardless of class.