Thorson reverted to the Giants' practice squad Monday, Pat Leonard of the New York Daily News reports.
The second-year man out of Northwestern was made available as a depth option behind Colt McCoy for a Sunday night matchup against the Browns, with Daniel Jones (ankle) deemed inactive for the cross-conference showdown. Thorson didn't see game action, however, and he remains without an NFL pass attempt over stints with the Eagles, Cowboys and Giants.