Harden and the Brooklyn Nets returned from a week-long COVID-19 hiatus to beat Los Angeles 122-115 Saturday night.
There were hopes that Durant could potentially be cleared based on a new agreement the league and the NBPA are working on.
The Lakers also announced that veteran wing Kent Bazemore has entered the protocols, furthering their roster issues.
Horton-Tucker is currently the only member of the Lakers that is in the NBA's health and safety protocols.