Bulls’ momentum good, but big man Nikola Vucevic still has concerns

Bulls big man Nikola Vucevic knows that there’s a lot to feel good about with four regular-season games left, but there’s also a lot of work to still be done. (Nam Y. Huh/AP)

Bulls center Nikola Vucevic heard the friendly jab from across the locker room.

Vucevic was putting on his socks while teammate Zach LaVine was breaking down the game with the media. LaVine said Vucevic was defending the rim, ‘‘even though he doesn’t jump real high.’’