Harrell was waived by the 49ers on Tuesday.
Harrell was placed on the reserve/COVID-19 list Wednesday, Jennifer Lee Chan of NBC Sports reports.
Harrell was cut from San Francisco's practice squad Wednesday, Jennifer Lee Chan of NBC Sports San Francisco reports.
Harrell has been suspended six games for violating the NFL's policy on performance-enhancing substances, Matt Maiocco of NBC Sports Bay Area reports.
Harrell was cut by the 49ers on Saturday.
Harrell signed a contract with the 49ers, Cam Inman of The San Jose Mercury News reports.