Daizen Maeda had given the visitors an early lead, only for David Watson to equalize for the hosts. However, towards the end of the game, Celtic were awarded a penalty, and Iheanacho, who came on in the 70th minute, confidently dispatched a powerful left-footed shot to seal the win.
"I’ll feeling really, really good," he said. "It’s the last kick of the game and I got to take it, so I’m really happy.
"I’m happy for the opportunity and I could see how the fans feel after that goal. It was a really important goal so I’m happy.
"It’s a great feeling but, at the same time, there’s a lot of pressure as well with the spot-kick. But I just took it with composure and we win the three points today which is massive, and hopefully there are many more to come."