"For me, the saddest part about all this is that the spectators love watching me play and I love playing for England," said the former Hampshire and Nottinghamshire man.
"The politics is what I have to deal with personally. It's tough being me and playing for England, it's tough."
Captain Andrew Strauss said the Pietersen controversy would not cause a distraction in the run-up to the third Test at Lord's, a match that England need to win in order to level the series and keep their spot at the top of the world rankings.
"It's always the case that you want to take anything that's happening off the field, put it to one side and concentrate on winning a Test match for England," said Strauss.
"It's important to stress that the team spirit in this England side over the past three years has been outstanding. It's something we pride ourselves on and will continue to."
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