The 39-year-old thinks the "football incident" has been blown up due to a focus on the lack of decision from referee Mark Halsey, but said the player is reacting well
The 21-year-old was not punished for the challenge on March 17 becuase referee Mark Halsey did not fully see the incident and he then escaped retrospective action because one of the officials had seen the tackle, but not seemed it a foul.
The Latics boss has continually defended his youngster from critics, insisting that he showed no intent, and has now suggested football should move on so his young player is not negatively effected.
"I think we've been going on and on too much about it," he told reporters. "I think it was a football incident.
"We lost Ryo Miyaichi a couple of weeks back and he had to go through surgery and he's out for the season. Those are incidents that happen in the game. I think we're taking things out of context here. I think the whole incident has been a bit of an argument about the refereeing in the game.
"It was a challenge with no real intent. It was an unfortunate incident that happens on a football pitch. I think we've been talking too much about it and it's a bit unfair on a young man to have to suffer that."
The 39-year-old then admitted he was nervous about how the Englishman would react to being thrown into the spotlight, but reassured fans the player has reacted well in training.
"I did have concerns straight away," he added. "Anyone would. All of a sudden you are the centre of a nationwide debate where you've done nothing wrong in terms of your intent.
"But Callum has been growing into the footballer he is now for the last four years. He's had a very good development at the club.
"He's been out on loan and I think he's had enough experiences to know how to cope with anything the Premier League is going to throw at him.
"But, looking at the way he's reacted in training, he's a joy of a human being and I know he'll become a stronger person after that."