Hardy re-signed with the Bills after being released on Tuesday.
Hamler was signed after being left off the 53-man roster on Tuesday.
Cuts were made as NFL clubs announced their 53-man rosters.
The Nittany Lions are still trying to narrow down the right tackle spot between Nolan Rucci and Anthony Donkoh.
Chisena spent three years with the Vikings before signing with multiple teams and ending up with the Cardinals.
Ellis played for the Nittany Lions from 2019-23.