According to the Detroit Lions, they have signed the following five players to Reserve/Future contracts.
WR Victor Bolden
G Evan Brown
S Jalen Elliott
WR Tom Kennedy
LB Anthony Pittman
In case you were wondering, Reserve/Future contracts are generally given to players who a team believes could make a run at the roster in the following season. The contracts do not go into effect until the next league season begins (March) and will not count against the current cap. They will count against the 2021 salary cap and 90-man roster.