A source familiar with the process told NBC News that Pfizer is expected to apply for approval this week for a Covid 19 vaccine booster for teens 16 and 17 years old.
If approved, the additional Pfizer-BioNTech shot would be the first vaccine booster for teens younger than 18.
The Washington Post first reported on the anticipated move.
The application for regulatory approval from the Food and Drug Administration is expected to come this week, but there is no timeline for when the department will act.
The department, which didn't say anything Monday night, authorized booster shots for all adults earlier this month from Pfizer and Moderna.
A new variant of coronaviruses, known as omicron, is spreading around the globe, worrying experts and pushing President Joe Biden to urge caution and again, implore Americans to get inoculated.
Most Americans are fully vaccinated but not yet boosted. On Monday, the Centers for Disease Control and Prevention said that all adults should get Covid-19 booster shots when they are eligible, striking a much stronger tone than its recommendations just a few weeks ago.
CDC director Rochelle Walensky said that everyone ages 18 and older should get a booster shot when they are 6 months after their initial Pfizer or Moderna series. Anyone who received the single-dose Johnson vaccine shot at least two months ago would qualify.