Daniels was selected in the fourth round (132nd overall) of the 2012 draft by the Green Bay Packers who first noticed him a year before when looking at other defensive linemen from Iowa. Defensive coordinator Dom Capers commented that "The thing that jumps out at me is the way he plays the game." He scored his first touchdown on December 9, 2012 against the Lions after recovering a fumble by Matthew Stafford. During his rookie season in 2012, Daniels played 14 games with 12 tackles, 2 sacks, 1 pass defended, and 2 fumble recoveries. In 2013, Daniels appeared in 16 games making 28 tackles and 6.5 sacks. In 2014, Daniels started all 16 games with 47 tackles and 5.5 sacks. On December 14, 2015, Daniels signed a 4-year contract extension worth $42 million. On December 27, 2015, despite the Packers' bad performance on the offensive line and being blown out 38–8 by the Arizona Cardinals, Daniels snagged his first interception from Carson Palmer. Daniels finished the 2015 season with 49 tackles, 4 sacks, 1 interception, 2 passes defended, and 1 forced fumble.
