Manchester United's Nani has apologised for the headbutt on Lucas Neill that resulted in the winger being sent off in Saturday's 4-1 win over West Ham.
Nani may face internal disciplinary action on top of a three-match ban for the 37th-minute dismissal and left Old Trafford before the end of the game.
"I recognise that my action was a thoughtless one but I also have to say I was provoked and attacked," he said.
"I know it serves as no excuse but that's exactly what happened."
Nani's dismissal does not rule him out of the Champions League final on 21 May when United will play Chelsea.
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"I regret having done what I did and I have to be thankful for the fact that my team-mates secured a win, which was extremely important to us," he added.
"I want to publicly ask for forgiveness, firstly of my team-mates, who were forced into a greater effort during more than 60 minutes, then secondly of my manager and coaches and thirdly of the United fans, who have given me so much affection."
Nani tried to justify his early exit from the ground after being sent off but is aware he made a mistake.
"Believe me, it was difficult," he stated. "At that moment I only wanted to disappear. That was what I did. I also ask forgiveness of the fans and the club for that.
"On Tuesday, I'll be in the changing room to redeem myself for my mistake."
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