Aston, the son of Eagles coach Mark Aston, has played in all five of Sheffield’s Championship games so far this season. He made eight appearances in 2014.
He has progressed through the Eagles’ youth set-up, the latest of a group of South Yorkshire-based youngsters who have broken into the first team.
“Cory is progressing along nicely. He played four games in 2013, eight games last year and has appeared in all five so far this season. He hasn’t looked out of place,” said Mark Aston.
“He still has work to do, we know that, but he is only 20. We’re delighted he has committed his future to us.
“There were a number of people seeing his potential and looking to take him to their clubs, so we thought the time was right to offer him a five-year extension and keep him here for the foreseeable future.
2It shows our aspirations. Michael Knowles and Steve Thorpe have recently signed new deals and now Cory has too, which is great for the club.
“The five-year contract shows how much we value him. We need to get his best years out of him here in Sheffield, and it makes a statement of what we intend to do.
“He is delighted – he is born and bred in Sheffield and his dream was to play for the Eagles as a professional.
“He has done that – now he wants to cement his position in the first-team and play at the highest level he possibly can.
“Cory wants to play in Super League and the dream is for him to realise that while playing for us.”