Castleford Tigers: Tigers and Trinity are victims of game's cross-border expansion
He played more than 300 games for Castleford, returning for a second spell having distinguished himself further with Australian club Manly between 1971-1975.
"I am mortified to think Castleford could lose out on a Super League spot," said Reilly.
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Hide Ad"It would be tragic given the club's history and the breeding ground it has been for international fooballers.
"However, Wakefield Trinity supporters and ex-players will have the same view about their club as well.
"Frankly, I'm disappointed it is even being contemplated to keep a side in Wrexham or Perpignan as opposed to where the game generated its history.
"It bewilders me. I would fear for Castleford if they did miss out on a licence.
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Hide Ad"It would be very difficult for them to regain their position and it's the RFL's fault as much as anybody's if that does happen.
"They should have some responsibility for supporting and maintaining these clubs in the competition.
"I just don't believe it's fair developing teams like Catalans and Crusaders – saturated with overseas players – when there are clubs like Cas and Trinity on our doorsteps. Wales and the south of France isn't. I am all for expansion but not at the expense of clubs that have supported the game over all these years."