The former Arsenal forward was named on the bench at Goodison Park but looked in line to come on and make his third substitute appearance of the campaign when Marko Arnautovic suffered an injury moments after scoring West Ham's third goal of the game.
"In my current club, players warm up in series of 3 to 5 minutes, in continuous rotation", he explained. In the moment Marko got injured, I was on the bench after warming up.
"Given the false information spread by the media that has affected my image, I am obliged to explain the only truth: I have never ever refused to warm-up in my whole career, let alone play a match", Perez said via Twitter on Monday.
"I really hope that some people never never gonna doubt again about your commitment or say that you didn't give your best on the pitch because they really don't know the kind of person, professional and hard worker you are".
On the day of his birthday, Manuel Pellegrini was also quick to dismiss talk of a bust-up.
She said: 'Just a message to say I'm just so so proud of you my husband, trying to play for your team after what we just lived this week.The lost of you dad.More news: Roberto Firmino a doubt for PSG clash with eye abrasion
"Antonio was ready, and Lucas had to warm up a little bit more". I was anxious about the game, because I was absolutely convinced we must end these bad results.
"We believe in what we are doing and we are not going to change".
Yarmolenko scored his second goal of the game with a spectacular shot from the edge of the box on the half hour mark to double West Ham's lead.
West Ham haven't exactly had the start to their season that they would have expected.
"We had already taken too long over the substitution so I put Antonio on. I'm convinced, and the players are convinced".