49ers will not pick up contract option on nose tackle Earl Mitchell

49ers nose tackle Earl Mitchell (90) during practice on Tuesday, June 13, 2017 in Santa Clara, Calif.

49ers nose tackle Earl Mitchell (90) during practice on Tuesday, June 13, 2017 in Santa Clara, Calif.

The 49ers will have a new man in the middle in 2019.

In a move that was foreshadowed late in the season, the 49ers will not pick up the option on the final two years of nose guard Earl Mitchell’s contract, the team said.

Mitchell, 31, who will become an unrestricted free agent, was replaced in the starting lineup by D.