Bolstering interior protection and the defensive edge, San Francisco swaps underperforming blockers for a veteran presence while securing vital pass-rush insurance as the preseason intensity ramps up.

The 49ers signed defensive lineman Victor Dimukeje and offensive lineman Nick Zakelj to one-year deals, the team announced Monday.

The 49ers released Kion Smith to make room for Zakelj

The San Francisco 49ers on Monday before taking the practice field signed a veteran offensive lineman and released their own former sixth-round pick.

The 49ers have made a pair of roster moves on Monday.

San Francisco maintains offensive line depth by extending Nick Zakelj on a one-year deal.

The 49ers are keeping one of their impending free agents from hitting the open market.