Nick Fozzard has resigned from his post as Commercial Manager at Castleford.
His wife Sarah has also resigned from her post as Marketing Manager.
Interim CEO Steve Gill said: "It is with disappointment that we confirm the departures of Sarah and Nick from the club. I’d like to take this opportunity to thank them both for their efforts.
"The Membership scheme has been a fantastic introduction to the club and Sarah played no small part in its delivery. We wish her well.
"Nick’s transition from player to commercial manager was amazing to see. We hope that his next venture in life is prosperous and one that gives him fulfilment.
"The aim of all remaining staff is to roll our sleeves up and ensure the backroom team are in a position to make the most of the positive start to the season made by the players and coaching staff."
The resignations follow on from last week's departure of chief executive Steve Ferres.
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Salford forward Josh Jones could be out for the next six weeks after breaking his hand in the friendly win over Rochdale.
Sheffield Eagles have added centre Perry Whiteley to next season’s squad after agreeing a one-year deal.