Speaking on Wednesday after receiving a title deed for the Buxton Estate from Family Bank, Joho said health must be given priority in the region.
He said the two hospitals will be modernised to offer improved services to Mombasa residents without having to rely on the Coast General Hospital which has been hit by a shortage of medical supplies and staff.
"We are going to modernise the Kongowea and Likoni hospital to bring medical services closer to the residents," he said.
Joho said part of the Kongowea dispensary land had been grabbed by a former councilor in the defunct municipal council, but has since decided to give it back.
He said they will construct new blocks on the grabbed land to increase the capacity of the hospital and employ more staff.
The advertisement appearing on the Tuesday's newspaper invited tenders for construction of two county hospitals since health is now a devolved function.
A mandatory pre-bid meeting and site visit for successful bidders will be held on March 31, at the county assembly hall, read the advert.