ESPN's Chris Forsberg reported the Celtics had planned to introduce Williams to reporters at 11 a.m. ET but have since postponed the call. The Athletic's Jay King reported it was a "simple miscommunication" between Williams and the Celtics.
Boston selected Williams with the 27th overall pick Thursday night. Many agreed the Celtics got great value with the move. Bleacher Report's Adam Fromal gave Boston an A grade on draft night.
Williams averaged 11.1 points, 8.7 rebounds and 2.5 blocks in his two seasons with the Texas A&M Aggies, and he'll be a solid backup center behind Al Horford, addressing one of the Celtics' few needs heading into the 2018-19 season.
However, experts acknowledged Boston assumed some risk by adding Williams:
Jonathan Givony @DraftExpress
Danny Ainge does it again. The rich get richer, as the Celtics add the #12 player in the ESPN 100 all the way down at #27. Concerns about his off-court habits, and some question marks about his knee, sunk Robert Williams' stock, but this might end up being the steal of the draft.
Friday's miscommunication is unlikely to mean much in the grand scheme of things, but it furthers the notion Williams could experience some hiccups early in his NBA career as he finds a role in Boston.