The 31-year-old front-man showed promise during his initial loan spell at United last season.
But the Nigerian has not found much game time since the Premier League Project Restart, and Ezeji hopes Solskjaer gives him more chances.
"Every coach believes in his starting XI and to be very fair to Ighalo, the Covid situation did not help him, because if not for Covid, [Marcus] Rashford would still have been out until the end of the season," Ezeji told Goal.com.
"And when Rashford recovered, because of the belief Ole has in Rashford, he had to bring him back into the team.
"And then you can see that [Anthony] Martial was firing on all cylinders, same as [Mason] Greenwood, so there was no way Ole was going to drop any of those guys for Ighalo.
"But where I will fault Ole is that even when these guys are not meeting up in some games, I think he should have tried Ighalo.
"It wasn't really nice that a player's contract was renewed and you didn't even allow him to play up to 20 minutes of any Premier League game. That is not encouraging. It makes a player lose all the confidence he has built over time."