Johnson announced on Twitter that he has received an offer from Nebraska.
The offer from the Cornhuskers joins the one he already had from UCF.
As a freshman last season, Johnson posted 53 tackles, three sacks, five tackles-for-loss, one forced fumble, one fumble recovery and an interception from his defensive tackle spot.
Johnson will graduate in December and he will have three years to play two following the 2016 football season.
Isaiah Johnson Scout Profile