It would be odd adding a player from the same conference, knowing it's a near certaintly that you will play against his team next season but if the parties involved don't mind, then I would ask either Reggie Lynch (Minnesota), Mike Watkins (Penn State), or Tony Carr (Penn State) if they would like to join the squad.
Just looking at the top shot-blockers of this past regular season I'd be happy with any of these players being asked and accepting an invitation to join the '17-'18 Purdue team in the WUG as well: Ben Lammers (Georgia Tech), Brandon Gilbeck (WIU: Purdue played them this past season), and Tai Odiase (UIC)
http://www.espn.com/mens-college-basketball/statistics/_/seasontype/2