Confidential minutes of a National board meeting in March reveal high-level concerns over the influence of party member Simon Lusk in the party.
But Prime Minister John Key, who was absent from the board meeting, suggested he did not share that view: "I don't have any great concern."
Mr Lusk, who is based in the Hawkes Bay, has been a campaign strategist and adviser to MPs at various times and runs his own private candidates college that is not sanctioned by the party.
In an embarrassing leak, the March minutes have been obtained by Labour MP Trevor Mallard, who in the past has accused Mr Lusk of having orchestrated the Act leadership coup against Rodney Hide.
The minutes reveal that senior whip Michael Woodhouse reported to the board he had spoken to MPs with "an involvement" with Mr Lusk.