•Mudavadi took over the office on Tuesday.
Prime CS Musalia Mudavadi formally takes over Foreign Affairs docket from CS Alfred Mutua (Tourism)
Speaking on Tuesday, Mudavadi pledged to address concerns of Kenyans abroad.
"Whenever any Kenyan in the diaspora will be in distress, we deploy diplomatic tools to ensure protection of our people," he said.
"I shall promote and project the image of Kenya globally."
Mudavadi was handed the Foreign and Diaspora docket following a mini Cabinet reshuffle by President William Ruto on October 4.
Head of Public Service Felix Koskei said the additional role assigned to Mudavadi was aimed at promoting Kenya's national interests.
He said these interests will be both in the global stage and strengthening strategic partnerships with other countries through both bilateral and multilateral efforts.
On Friday, Koskei said the Public Service Commission had designated ministries and state departments to new office space following the Cabinet reshuffle.
He said Mudavadi's office had been moved to the Old Treasury Building just across the Railways Headquarters.
But the Prime CS released a statement and clarified that his office will remain at Railways.
"For the avoidance of doubt, the Office of the Prime Cabinet Secretary and Cabinet Secretary for the Ministry of Foreign and Diaspora Affairs remains at the Railways Headquarters," Mudavadi said.