is reporting that the Kansas City Chiefs have signed Alex Smith to a four-year contract extension.
ESPN and various media reports have the extension worth about $68 million. The Kansas City Star was the first to report the news.
"It was a priority of ours to get this deal done and keep Alex in a Chiefs uniform long-term," Kansas City general manager John Dorsey said in a statement. "Alex is a proven leader on and off the field. He is a special individual with a lot of ability, and we are fortunate to have him here."
The Chiefs acquired Smith last year in a trade with the San Francisco 49ers. The Chiefs gave up second-round draft picks in 2013 and 2014. Smith has one year remaining on his current deal, so the extension keeps him in Kansas City through 2018.
Last year, in his first season as the Chiefs' starter, Smith threw for a career-best 3,313 yards and 23 touchdowns.