The 31-year-old Nigerian has been at Old Trafford since January, on loan from Chinese Super League outfit Shanghai Shenhua, scoring five goals in 19 competitive games.
He started on each occasion when he scored and his best strike came in a 5-0 bashing of LASK in the first leg of the Europa League Round of 16.
The former Watford man received a lovely ball from fellow January signing Bruno Fernandes in the 28th minute and brilliantly controlled the ball, first with his right foot, and then switching to his left, before sending in a powerful volley beyond the reach of Alexander Schlager in goal for LASK.
The precision and technique of the goal illustrated Ighalo at his best, but it could not win him the best goal of the campaign with Rashford ultimately taking it in a poll conducted on the Manchester United website.
Rashford had a storming season for the Red Devils until a back injury befell him in January, which prompted the temporary purchase of Ighalo from China.
The England forward was, however, able to recover from his injury after the resumption of football from lockdown restrictions caused by the coronavirus pandemic.
Rashford’s award-winning goal came in an EFL Cup fourth-round tie against Chelsea at Stamford Bridge on October 30, 2019.