The Latics took the lead when former Sky Blues youngster Jonson Clarke-Harris headed in right on the stroke of half-time and City skipper Carl Baker equalised with a stunning overhead kick after 73 minutes.
But the game's real talking point came before either team had found the back of the net.
Just after the half-hour mark Coventry striker Callum Wilson raced through one-on-one only to be taken out by Oldham goalkeeper Mark Oxley outside the area. Referee Dean Whitestone issued a yellow card for the challenge, much to the dismay of the home crowd.
Pressley said it was 'a definite red card' offence but Johnson disagreed, saying: "I didn't actually think Oxley would be sent off.
'I thought Wilson was touching it away from goal - had he been touching it towards goal it could've been different.
"We clearly did have cover, and I was actually sat there and not for one minute did I think it was a red.
"It was a good game and I enjoyed it but we've been undone again by another quality goal - a overhead kick from the edge of the box.
"We've come here and we've come to win the game and I think our fans will be happy with that against a top side in our division. We've had two good points over Christmas but it's now important to follow that up with a win on New Year's Day."
- Sports & Recreation
- Callum Wilson