The Lions elected to hold tight at No. 21 and selected Florida LB Jarrad Davis, rather than trading the pick to the interested teams.
Ian Rapoport of NFL Media reports that the three teams have contacted the Lions about their No. 21 overall pick including the 49ers.
There are plenty of notable players still on the board including LB Reuben Foster, TE David Njoku, DE/OLB Charles Harris, RB Dalvin Cook and all of the offensive line prospects.
Reports from the past few weeks indicated that the 49ers could have interest in Foster, who is considered to be the best available player by a number of experts right now.