Sept. 8 (UPI) -- The San Francisco 49ers and starting right tackle Colton McKivitz agreed to a three-year, $45 million contract extension. Sources told ESPN, The Athletic and NBC Sports Bay Area about the agreement Monday morning. McKivitz's pact includes $27 million guaranteed and ties him to the 49ers through the 2028 season. McKivitz, 29, joined the 49ers as a fifth-round pick in the 2020 NFL Draft . He started every game for the 49ers in 2023 and 2024. He appeared in 62 games through his