"My conclusion is clear: I no longer want to participate in this situation." If there is an abscess, a bit of medication is not enough. You have to use the scalpel and cut it open. I want the structure to be totally transparent."
Rabbatts had been a member of Fifa's anti-discrimination task force chaired by Jeffrey Webb, the Fifa vice-president from the Cayman Islands who was one of the seven officials arrested in Zurich on corruption charges last week.
In her resignation letter to Jerome Valcke, the Fifa secretary general, Rabbatts said: "Like many in the game I find it unacceptable that so little has been done to reform Fifa and it is clear from the re-election of president Blatter that the challenges facing Fifa and the ongoing damage to the reputation of football's world governing body are bound to continue to overshadow and undermine the credibility of any work in the anti-discrimination arena and beyond."
New Zealand barrister Nick Davidson who stood down from the ethics committee, raised concerns over the report by Michael Garcia into World Cup bidding. "Investigators need to know the whole story. Fifa's investigation team is independent, determined and very capable. There are some matters which must be addressed to make it as effective as it needs to be.
"At the heart of the Fifa building, Fifa-branded suits, in my view, are incompatible with that independence. Telecommunications must be fully secure and I had my reservations about that."
The spotlight will turn this week to UEFA ahead of the Champions League final and whether Platini is prepared to follow through his call last week for Blatter to resign with decisive action to lead change. UEFA, though, will not boycott the World Cup and Platini said that its 17 members will be "open to all options".
Blatter denies any wrongdoing.