United were left lacking in the striking department when Lukaku joined Inter Milan on the final day of the summer transfer window.
And following a long-term injury to Marcus Rashford, United were then left with no option but to sign Ighalo from Shanghai Shenhua.
Ighalo is set to be included in the United squad for the first time in Monday’s home clash against Chelsea, having completed an enforced 14-day spell away from his new side due to coronavirus fears.
And two-time African Player of The Year, Kanu, is confident that he can make impact.
“Yes he can replace him (Lukaku),”Kanu told Goal.
“If you watch him play, you’d find out that he is strong and can score goals.
“What he needs is the service. In this team, I am sure his game will improve because the team has great players.
“Despite playing in the Chinese league, Ighalo is not a player you would look down on and say he is not a good player.
“I believe in him and I know he can deliver if given the chance. Bringing him to Old Trafford means that those in the club believe in his ability, and we have to respect that.
“I don’t think he will not disappoint because he will give them value for their money.”
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