Castleford have released Australian scrum-half Brett Seymour from his trial period without him playing a match for the Super League club.
Castleford Tigers have drawn up a short-list of candidates for the role of head coach from nine applicants.
Castleford Tigers have announced a new signing from Leeds Rhinos.
Castleford have linked up with Championship One club York and will launch the partnership with a pre-season friendly on Sunday January 19.
The clubs have come together after scrapping last season's respective dual-registration agreements with Keighley and Hull.
York were relegated from the Championship in 2013 and are hoping their partnership with Castleford will help them win back their place in the second tier of professional rugby league.
Castleford prop forward Ryan Boyle has signed a two-year contract extension.
The 26-year-old, who rejoined the Tigers from Salford in mid-season, was under contract until the end of next term but has now extended his stay until the end of 2016.
Castleford Tigers have completed the permanent signing of London Broncos centre Michael Channing on a two-year deal.
The 21-year-old moved to the Tigers on loan in July and impressed enough to secure a long-term stay after scoring three tries in four Super League appearances.
Castleford coach Daryl Powell said: "Michael has fitted into the club seamlessly as both a player and a person.
"He is a young centre with a lot of potential who will continue to thrive in our culture."
Channing said: "I'm really happy to get a permanent deal sorted at Castleford. Cas are one of the big names in Super League, so it's good to be offered a contract from being on-loan."
Brett Seymour has returned to the Super League after signing a one-year deal with Castleford. The 28-year-old half-back had a high-profile exit from Hull earlier this year, with his departure from the KC Stadium preceded by two months of compassionate leave.
Seymour was taken to hospital in March after crashing his car, with his wife later saying he was "desperate", suffering from depression and may have been trying to take his own life. Hull allowed him time to deal with his off-field problems before releasing him in April.
Castleford have made Salford centre Ashley Gibson their first signing for 2014.
The 26-year-old former Leeds player, whose contract with the Reds runs out this year, is joining the Tigers on a two-year deal.
– Ashley Gibson
I'm chuffed to sign for Castleford Tigers. When my manager came to me saying that Cas were interested in me I was over the moon. There were a couple of other offers but I wanted to be playing my rugby close to home so it's a great opportunity for me in Castleford."
Ashley Gibson has spent the last four years at Salford and has scored 54 tries in 111 Super League appearances.
– Daryl Powell, Castleford coach
Ashley is a player that I have rated since I coached at Leeds when he was a young player coming through the system. He is a versatile and skilful player with a great attitude and his signing further strengthens the quality and depth in our squad for next season."
Gibson is set to face his next employers when Salford visit Castleford on Sunday in the penultimate match of the season.
Castleford Tigers have confirmed that stand off Rangi Chase has submitted a request to leave the Super League club. The 27 year old England international, who's made 24 appearances, scoring 6 tries for the club this season, won the Super League man of steel award in 2011.
He's been with the club since signing from Australian NRL side St George Illawarra in 2009.
Castleford Tigers have signed former Hull KR back rower Frankie Mariano from Super League neighbours Wakefield.
The 26-year-old will join the Tigers on a 12-month deal when his current contract with the Wildcats expires at the end of the season.
Mariano, who made the latest of his 46 appearances for Wakefield in their 24-14 win over Widnes on Monday, played under Castleford coach Daryl Powell earlier this season when he had a loan spell at Featherstone.
– Frankie Mariano
"It will be good to work with him again. I feel comfortable talking to him and, having worked with him already, I don't class him as a new person so that was a big part of the move."
– Daryl Powell
"Frankie is a big and athletic back rower who can punch holes in opposition defences.
"He's also versatile with a strong ability to play in the centre equally effectively.
"His addition for next year brings size and experience to the squad and further enhances the competition for places in our forward pack."
Castleford have agreed a new deal with Australian forward Grant Millington and will take London Broncos centre Michael Channing on loan to the end of the season.
Former Leeds favourite Daryl Powell will be aiming to pile on the agony for his old club tonight when he takes his Castleford side to Headingley.
The champions are reeling from four straight defeats and the loss of England internationals Kallum Watkins and Danny McGuire to injury but Powell, who was in the last Leeds team to win the Challenge Cup and went on to coach them, has little sympathy for their current plight.
The Tigers are looking to complete a first Super League double over their big-city neighbours following their 14-12 triumph at Wheldon Road in February and Powell believes his players will also have derived confidence from the three competitive matches under which he has presided.
"It's a big challenge for us obviously. Leeds have got a few people missing but they've got a deep squad, " said Powell.
"I'm looking forward to the challenge. We're not far off in games at the moment. We're not playing at our best consistently but we're certainly in the battle every single week.
"There's some confidence there. We've played them twice this year - we've beaten them once and run them close in the Cup - so there's not much in terms of the games that have been played this year."
Castleford are angry over a decision to bring forward the kick-off time for next Saturday's Super League match against Catalan Dragons in Perpignan.
The match, which will be the first for new Tigers coach Daryl Powell, has been moved from 6pm to 3pm after the Rugby Football League accepted a request from French television.
Castleford say they objected to the late change because of the disruption caused to fans who put their travel arrangements in place weeks ago.