為什麼卡卡入球後感謝上帝遭警告?

這是根據國際足協所頒佈現行球例第4條的規定，原文如下：
Decisions of the International F.A. Board

Decision 1

Players must not reveal undergarments showing slogans or advertising. The basic compulsory equipment must not have any political, religious or personal statements.
A player removing his jersey or shirt to reveal slogans or advertising will be sanctioned by the competition organiser. The team of a player whose basic compulsory equipment has political, religious or personal slogans or statements will be sanctioned by the competition organiser or by FIFA.
以前是沒有這條例的，但由於許多球員入球後都展露球衣下面件打底衫的標語，國際足協決定禁止所有球員入球後展露球衣下面件打底衫的標語。
有關種族、政治、宗教等的標語有時確然會引起球迷騷亂，國際足協禁止球員展露標語是一視同仁，不分那個宗教，怕的是做成球迷騷亂。