The Dallas Cowboys star is now the highest-paid running back in NFL history. . The six-year, $90 million contract extension includes $50 million guaranteed, according to ESPN. . Todd Gurley's $45 million guaranteed was the previous high for a running back. . Elliott was a holdout for all of training camp and preseason. . The running back is expected to attend Cowboys practice on Wednesday. . Elliott was selected by the Cowboys with the No. 4 overall pick of the 2016 NFL Draft. . He led the league in rushing his rookie season and again in 2018. . Elliott is the fifth player since 1970 to lead the league in rushing in two of his first three seasons.