It’s official — Mayor Bill de Blasio will be on the sidelines for the third round of the Democratic presidential primary debates.

ABC — which is hosting the Sept. 12 affair in Houston — made the announcement on Thursday afternoon.

The network confirmed that 10 candidates — the smallest debate field yet of the 2020 campaign season — met the Democratic National Committee’s entry requirements for the next showdown.

The presidential hopefuls include former Vice President Joe Biden, New Jersey Sen. Cory Booker, South Bend, Indiana, Mayor Pete Buttigieg, former Housing and Urban Development Secretary Julián Castro, California Sen. Kamala Harris, Minnesota Sen. Amy Klobuchar, former Texas Rep. Beto O’Rourke, Vermont Sen. Bernie Sanders, Massachusetts Sen. Elizabeth Warren and entrepreneur Andrew Yang.

Ten other candidates in the slowly shrinking primary field were left out.

Next month, candidates will have the opportunity to give opening statements, but unlike the first two debates, there will be no closing statements.

They will also be granted a 75-second direct response time to questions — and 45 seconds for rebuttals.

ABC News’ George Stephanopoulos and David Muir will join ABC News correspondent Linsey Davis and Univision’s Jorge Ramos as moderators.

Houston’s debate will be held at Texas Southern University and will air from 8 to 11 p.m. Eastern time.