His current three-year mandate is scheduled to end in December 2027, but the top UN job would have a January 1 start date.
Sinirlioglu served as Turkey's top diplomat for a few months in 2015 during an interim period between elections, and later worked as the country's UN ambassador between 2016 and 2023.
The diplomatic bid seeks the top global post as the organization prepares for a leadership transition.
Sinirlioglu is likely to reflect the Turkish president's agenda in the global role.
Seven other candidates are vying to replace Guterres when his mandate concludes.
The next UN chief will succeed Antonio Guterres, who has led the world body for almost 10 years and finishes his second five-year term.
Sinirlioglu was Turkey's top diplomat for a few months in 2015, an interim period between elections, and its UN ambassador between 2016 and 2023.
Seven other candidates are vying to replace Guterres as he finishes his second five-year term.
Sinirlioglu is likely to reflect the president’s agenda.