Green and University of Nebraska President Hank Bounds met with Eichorst earlier Thursday, then met with Nebraska coaches.
"The athletic director is not the one on the field coaching, he's not the one making them do these plays or this or that - and he's not running practices", said Husker fan Leah Huerta.
Riley said he appreciated Eichorst seeking him out for the job and that he and his staff continue to be thankful to be at Nebraska.
The search for a new director of athletics will begin immediately.
"In this case the chancellor and president have made a very hard decision I think it goes without saying that Shawn Eichorst has been a good friend to many of us individually who have gotten to know him personally one-on-one".
"I think at a point in time like this, you feel bad for Shawn and his family", Miles said.
"Mike Riley is our football coach", he said.
"That's (on court improvement) what's got to be most important to us". "We expect him to compete".
As for the unusual timing of Eichorst's firing, Green said he and Bounds had been having conversations about their eventual decision for a while, and as of Wednesday decided it was time to make a change. "I want to thank them for phenomenal past present and, even more importantly, future support".
"We've tried to develop and grow and be the best we can be", Riley said, "and we haven't done as well as we need to". He's impacted the lives of countless young people and we are grateful.
Nebraska - which spent $101 million on athletics in 2015-16, the most recent year for which data is available - has not won a Big Ten championship in football or basketball (men's or women's) since joining the conference in 2011. "Our fans and our student-athletes deserve leadership that drives the highest levels of competitiveness, as well as excellence across all facets of Husker athletics", said Nebraska chancellor Ronnie Green.
Though this decision comes after a 1-2 start from the Nebraska football team, President Bounds said Eichorst's dismissal is not exclusively about football coach Mike Riley and the team's performance, but extends throughout all of the sports in which Nebraska is competitive.