Lord Kerslake was chairman of the honours forfeiture committee when Fred Goodwin – the disgraced former chief executive of Royal Bank of Scotland – had his knighthood removed in 2012.
His comments came after Theresa May indicated this week that “steps should be taken” to review Sir Philip’s knighthood.
The prime minister said that if an honour recipient was bringing it into “disrepute”, it should be reviewed. The Forfeiture Committee can strip an individual of an honour.
Conservative MP George Freeman has said he will be “formally asking” the Honours Committee to review Sir Philip’s knighthood.
A government spokesperson said a request for the Honours Forfeiture Committee to review a person’s knighthood does not automatically trigger an investigation.
The Topshop owner recently dropped an injunction preventing The Telegraph from revealing the allegations against him, which included groping a female executive, holding another female employee in a headlock and telling a black employee that he was “still throwing spears in the jungle”.
The employees later signed non-disclosure agreements (NDAs) and were paid huge sums to stay quiet.
Sir Philip has said he “categorically denies any unlawful… sexual behaviour”.