Hair maintains he acted according to the rules of the game

The International Cricket Council has included the issue on the agenda of an executive board meeting on Friday.

"The letter outlines instances where we feel he violated the code of conduct," said spokesman Saleem Altaf.

"We believe that an inquiry is necessary as it will have a bearing on the compensation claim."

The England and Wales Cricket Board wants Pakistan to pay over �800,000 in compensation.

The Pakistan team refused to resume play at The Oval in protest against the decision of Hair and fellow umpire Billy Doctrove to change the ball and penalise them five runs for ball-tampering.

ICC adjudicator Ranjan Madugalle cleared Pakistan captain Inzamam-ul-Haq of ball-tampering charges but banned him for four matches for bringing the game into disrepute.

Pakistan claim that, after the umpires had awarded the game to England, Hair refused to resume the match despite requests from the ICC chief executive, the two boards and match referee Mike Procter.

A joint statement at the time said there had been: "agreement between the teams, the match referee and both the ECB and PCB to resume the fourth Test."

But it added: "it was concluded that with regret there will be no play on the fifth day."

The ICC said it regarded the matter as closed after the Inzamam hearing but Pakistan were already pressing for more investigation into Hair's role.

The game's rulers asked for a formal complaint outlining instances where the umpire might have acted beyond his powers before allowing any further action.

Hair has maintained he acted according to the rules of the game and is not biased against Asian teams.

The ICC did not include Hair or Doctrove on the umpires panel for the Champions Trophy in India, saying Hair was removed for "safety and security" reasons.