After meeting with specialists in Los Angeles, the Chicago Bulls' Mike Dunleavy is expected to need four-to-six weeks of additional rehabilitation on his back before he can be cleared to return for on-court work, league sources told Yahoo Sports. Dunleavy, a 6-foot-9 wing player, will undergo a re-evaluation at the end of the four-to-six week stretch to determine his fitness to return to basketball activities, sources said. Dunleavy, who has yet to play this season, underwent lower back microdiscectomy surgery 2½ months ago and suffered a recent setback in his push to return to the Bulls' lineup.