The Bulls will sign former LSU guard Brandon Sampson to a two-way contract to replace the injured Tyler Ulis, who has been playing for Windy City of the G League. Ulis underwent arthroscopic surgery on his left hip, the team announced. ... Lauri Markkanen received an autographed Dirk Nowitzki jersey that he requested when the Mavericks visited last month. The two worked with the same youth coach and hit it off when Markkanen visited Dallas for his predraft workout.