The 32-year-old actor shared his diagnosis in a statement posted on his Instagram page.
"Inspite of all care and precautions, unfortunately, I have tested positive for COVID-19. Following all essential protocols, I am under home quarantine, taking medication as prescribed by my doctor," Kaushal wrote.
On Monday, actor Bhumi Pednekar also confirmed that she had tested positive for COVID-19.
Kaushal and Pednekar were reportedly shooting for director Shashank Khaitan''s upcoming Dharma Productions movie "Mr Lele" in the city.
Kaushal urged those who came in contact with him to also get themselves tested.
On Sunday, Mumbai recorded its highest single-day spike of 11,163 new coronavirus cases, pushing the city''s caseload to 4,52,445.