Gordon was sent off just before halftime for a late challenge on Liverpool captain Virgil van Dijk. Gordon was initially shown a yellow card, but that was upgraded to red by VAR.
"I want to sincerely apologise to my teammates and the fans," Gordon posted to social media.
"My intentions were pure. I was just trying to create energy in the game and I mistimed the tackle. I also want to apologise to Virgil, I would never intend to tackle somebody like this on purpose. We spoke after and he knows that.
"More importantly, I'm so proud of the time I spent on the pitch and how we played tonight. The atmosphere from you all is what makes SJP so special.
"I love everything we stand for as a club and no more than right now. I'll be back and better, the same as every other setback I've ever faced. See you soon."