The San Francisco 49ers have promoted quarterback Adrian Martinez from the practice squad to the active roster ahead of Thursday night’s road game against the Los Angeles Rams. The 49ers (3-1) already had ruled out quarterback Brock Purdy (turf toe), making Mac Jones the starter against the Rams (3-1). Martinez, 25, has not appeared in an NFL regular-season game. The 49ers signed him to their practice squad on Aug. 28 after he was waived by the New York Jets. He spent time on the Jets’ practice squad in 2024 and also was in camp with the Detroit Lions in 2023.