Thomas suffered through a disappointing 2013 season, playing in nine games, but rushing for just 95 yards without scoring a touchdown. He performed much better this spring, and told reporters last season's struggles were behind him.
Amadi, leaves Boise State without playing in a single game as a Bronco. Per NCAA rules, the defensive back sat out last season after transferring from Hawai'i.
Boise State confirmed the news, but gave no reason as to why either player is no longer with the program.
Although Derrick Thomas was expected to be in the mix for carries behind Jay Ajayi, the backfield cupboard isn't bare.
Boise State still has three backs who saw playing time in 2013, a pair of freshmen, and two more backs coming in as part of the 2014 recruiting class. Jeremy McNichols and Cory Young are both very talented, but Coach Harsin and crew probably hope they'll redshirt in 2014.