Two headers from Tore Andre Flo and Dan Petrescu had given Chelsea the lead at Stamford Bridge.
Somehow Chelsea collapsed with 15 minutes left.
Kanu scored 75th, 83rd and 90th minute goals to complete his hat-trick and the comeback.
Chelsea keeper Ed De Goey raced out of his penalty box and allowed the Nigerian to grab the match-winner.
Source: DSG
