Shanghai Shenhua won the contest 3-1 on aggregate having lost the first leg 1-0.
The flower Of Shangahi have now won the FA Cup trophy five times.
Ighalo, who started the game on the bench took the place of Kim Shin- Wook in the 67th minute.
Shin-Wook gave Shanghai Shenhua the lead on the hour mark.
Stephane El Shaarawy got the second goal in the 81st minute, while Gabonese midfielder Alexander N’Doumbou added the third seven minutes from time.