Johnny O'Bryant is part of the Bucks rookie trio, a group that includes No. 2 overall pick Jabari Parker and forward Damien Inglis, taken with the first pick of the second round.
The 6-foot-9, 256-pound O'Bryant, selected 36th overall, signed a three-year contract with the team earlier this week.
The former Louisiana State star said he gained confidence from his experience in the NBA Summer League in July, when he averaged 8.2 points and 5.4 rebounds in five games.
"It was just getting used to the NBA-style offense we ran, getting used to the different play clock and the NBA rules," O'Bryant said Friday. "But overall it was a fun experience for me."
O'Bryant said he hopes to have a playing weight of 250 to 255 pounds during the regular season and "just be a load down there."
He said he relished the time in Las Vegas to get to know his teammates, including Parker and Giannis Antetokounmpo, and new Bucks coach Jason Kidd.