Marvin Bagley III completed a three-day visit to Duke on Sunday and is still exploring the possibility of reclassifying and playing college basketball this season, a source told CBS Sports on Monday.

Bagley has not publicly commented on the visit, but he arrived Friday and left Sunday, a source said.

Bagley has long been the consensus No. 1 prospect in the Class of 2018 -- a five-star athlete worthy of the compliments bestowed upon him. Some executives believe, if eligible, Bagley would have been the No. 1 pick in the 2017 NBA Draft, and that, if eligible, he also would be the No. 1 pick in the 2018 NBA Draft, which is among the reasons reclassifying is sensible and under consideration. And a source told CBS Sports earlier this month that it is academically possible for Bagley to graduate early -- though that doesn't necessarily mean he'll be able to do it.