May 20 (UPI) -- The San Francisco 49ers and Fred Warner agreed to a three-year, $63 million contract extension, which will make Warner the highest-paid linebacker in NFL history, his agency announced. Athletics First said Warner will receive $56.7 million in guarantees as part of the pact. The 28-year-old linebacker, who joined the 49ers in the third round of the 2018 NFL Draft, was set to become a free agent after the 2026 season. Warner totaled 131 combined tackles, 76 solo tackles, seven