Health CS Mutahi Kagwe has said that there will be no airlifting of patients from other counties to Nairobi.
This comes after President Uhuru Kenyatta reopened Nairobi, Mombasa and Mandera following months of cessation of movement into and out of the counties.
The President also gave a directive that local flights will operate from July 15, while international flight will operate from August 1st.
"There will be no capacity to be brought to Nairobi for treatment as Nairobi itself will be already overwhelmed. Where we are heading is unpredictable," Kagwe said.
"It is better to be ready than to be sorry."
He also said that before anyone boards a plane, he or she must be confirmed to be free from Covid-19.
Kagwe also stated that security agencies will be more vigilant in enforcing the curfew.
Health Director General Dr Patrick Amoth added that screening will be done at various points of entry and other infection control measures like hand washing, and temperature taking will be enhanced.
"We expect the peak in August if the containment measures are not observed," he said.
Kenya on Tuesday recorded 183 new Covid-19 cases, raising the total number to 8,250.
This is out of 2,061 samples, Health CS Mutahi Kagwe said on Tuesday.
From the cases, 177 are Kenyans while six are foreigners. A total of 119 are males while 64 are females.
Kagwe said the youngest is four years and oldest 79.
Nairobi leads with 100 cases.