Marlowe recorded 11 tackles (10 solo) in Sunday's 31-17 loss to the Chiefs.
The Chargers elevated Marlowe from the practice squad Saturday, Daniel Popper of The Athletic reports.
Marlowe was released by Buffalo on Tuesday, Adam Schefter of ESPN reports.
Marlowe has been ruled out for the remainder of Sunday's divisional-round matchup against Cincinnati due to a groin injury.
Marlowe will start Sunday's game against the Patriots, Joe Buscaglia of The Athletic reports.
Atlanta traded Marlowe to Buffalo on Tuesday in exchange for a 2023 seventh-round pick.
Marlowe is expected to start at strong safety in the absence of Jaylinn Hawkins (concussion) during Sunday's matchup against Carolina, Michael Rothstein of ESPN.com reports.
The Falcons re-signed Marlowe on Thursday, Michael Rothstein of ESPN.com reports.
The Falcons released Marlowe on Wednesday, Michael Rothstein of ESPN.com reports.
The Falcons have signed Marlowe to a one-year contract, Matt Urben of the USA Today reports.