The Manchester United winger was shown a red card after clashing with Raheem Sterling 11 minutes from the end of the match which ended 2-2.
Valencia grabbed the Liverpool player by the neck in retaliation to a bad tackle by the 19-year-old forward who went over the top of the ball.
He said: "I apologised to the team after the match and the coach.
"I am sorry for the fight with Sterling. When he tackled me I thought about Segundo Castillo.
"He nearly missed the World Cup because of injury and I feared I would too but thankfully I am OK."
Team-mate Castillo nearly missed out on Ecuador's World Cup squad because of a knee injury sustained against Mexico.
No bias towards either club as I'm a Spurs fan. The challenge didn't look too bad to me, he swung his leg in from the side and made contact with the ball well before the player. His foot was high and bounced over the top of the ball but normally when you see a player sent off in the EPL for a challenge with his foot off the floor, he's sliding in towards the opponent, not in from the side. I do agree that he could have (that's could HAVE) ended Valencia's WC but in any sliding challenge there's the chance of twisted knees, ankles, stretched ligaments etc on both parts so if you want to remove those risks I guess you have to outlaw the sliding challenge all together. Otherwise you can level that argument at a player numerous times per match. Let's face it though, meaty challenges like this aren't tolerated in European club competitions never mind internationals, so players know they have to change their game to suit. Having said that, I've often wondered why this should be the case - the laws of the game remain the same so the application of them should be similar. It's a contact sport after all and the EPL is one of, if not the most exciting leagues in the world to watch because of it's speed and physical nature - I often wish international football was a bit stronger & more physical.- Bongospur