Berggren has played this spring for the Howard Pulley Panthers AAU team. He shined in the Kingwood Classic, where he blocked four shots of McDonald's All-American Darrel Arthur.
Berggren said that the Wisconsin offer was his first.
"I went to the team camp and took an unofficial visit and talked to coach Bo Ryan," Berggren said.
Berggren will play in the Mid-American Camp in Atchinson, Kan., July 5-9 and will be with the Howard Pulley team at the Peach Jam in Augusta, Ga., the AAU nationals in Orlando and at the Price Chopper in Kansas City.
Berggren said that he is lifting weights four times a week.
"I'm working on my agility and shooting every day," he said.
Berggren said that he is between 6-foot-9 and 6-foot-10. He said that he has not grown recently, but his feet have.
"I just went up to a size 16," he said.
His father is 6-foot-5 and his mother is 5-foot-11.