Italian media reported that it was a routine intervention, and Lazio said the 66-year-old Sarri was expected to resume his regular duties in the coming days.
Lazio, eighth in the league standings, host third-placed Napoli on Sunday.
Lazio head coach Maurizio Sarri undergoes minor heart operation
Lazio head coach Maurizio Sarri has undergone a minor heart operation, the Italian Serie A club said on Monday.