Thika MP Alice Ng'ang'a has said the sacking of NYS director Japtha Rugut was done without consultation.
She said it is likely to create discord between partners in the Jubilee administration.
Ng'ang'a was speaking at a press conference in a Thika hotel after officiating the ground-breaking of Kiandutu Athena road yesterday.
She said Rugut's replacement with former State House controller Nelson Githinji will ruin the relationship among Jubilee supporters.
Ng'ang'a said Devolution Cabinet Secretary Anne Waiguru did not state reasons behind Rugut's sacking.
Nandi Hills MP Charles Keter and his Kapenguria counterpart Samuel Moroto said Githinji's appointment is "irregular".
"The sacking of Rugut is unwarranted. Replacing him with someone from Central Kenya does not make matters any better," Ng'ang'a said.
She said Rugut, a former provincial commissioner, has served the country "diligently".
Ng'ang'a said any appointments or sackings by the Jubilee government must be done with consultation.
"Nobody should try rocking the Jubilee boat unnecessarily. Githinji's swearing-in has created bad blood between the two main communities that support Jubilee," she said.
But the MP cautioned that the matter should not be politicized or creates antagonism between the Kikuyus and Kalenjins and called on Nandi Hills MP Charles Keter to stop playing cheap politics by seeking mileage from the sacking of Rugut and the subsequent appointment of Githinji.