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Electorate secretary Greg Presland said the committee would meet tonight to decide if a complaint would be laid and what the nature of that complaint would be.
"We are concerned about the ways in which it was dealt with over the past few days."
Yesterday Labour leader David Shearer was unanimously endorsed by the party's 34 MPs after he called an urgent vote to put to rest speculation of a leadership challenge.
Mr Shearer demoted Cunliffe to the back bench, stripping him of his economic development portfolio, for undermining him during last weekend's party conference and refusing to back him as leader.
Mr Presland said he sat with Mr Cunliffe throughout the conference and did not see anything wrong with his behaviour.
He said there was an element of "sabotage" in the way Mr Cunliffe had been treated.
Mr Presland said it was unreasonable to expect Mr Cunliffe to say how he would vote over the leadership on February 13 next year, when other MPs within the Labour Party also refused to say how they would vote.