Hull KR have given two-year contract extensions to back-row forwards Aaron Ollett and Steven Holker, two products of their academy system.
Ollett, 21, made his Super League debut last June and has appeared in six of the Robins' last seven matches.
Holker, 18, has yet to play Super League having spent most of the season on the injury list.
Hull KR have signed Huddersfield's Papua New Guinea international Jason Chan on loan to the end of the season.
The 30-year-old second rower has made 16 appearances for the Giants so far this year but is currently out of favour and is out of contract at the end of the year.
Chan met his new team-mates for training on Thursday morning and is likely to make his debut in Sunday's First Utility Super League home game against Salford.
Chan has made 63 appearances for the Giants since joining them from Crusaders ahead of the 2012 season but looks to have played his last match for them.
Wakefield have signed Hull KR centre Craig Hall on a two-year contract.
The 26-year-old former Hull player will join up with the Wildcats at the end of the season when his contract with the Robins runs out.
"I've had four good years at Rovers and now I want to take my experience to a fresh start at Wakefield," said Hall.
"I've loved every minute at Rovers. It's the club I supported growing up so it's been a proud four years for me. Hopefully we can pick up some good results between now and the end of the season then I can have a good rest and really rip in to pre-season and have a big year next year."
Hall has spent his entire career on Humberside apart from a five-game loan spell at Widnes where he played alongside Wakefield head coach, James Webster.
"I'm delighted to get Craig on board for 2015," said Webster. "Craig is a player that possesses great speed and we feel that his all-round game and versatility will add plenty to our current squad."
Hull KR chief executive Mike Smith said: "I'd like to thank Craig for everything he has done for the club over the past four seasons.
"With Darrell Goulding joining us for next season and adding to the likes of Kris Welham, Liam Salter and Macauley Hallett who are already in the squad, we have plenty of options in the centres and can appreciate Craig's desire for regular first-team football at this stage of his career."
Hull KR have sacked head coach Craig Sandercock with immediate effect.
The Robins announced the move on Thursday night and have put assistant Chris Chester in charge ahead of Sunday's home game against St Helens.
A statement from the club said: "The club has made the decision not to renew Craig's contract in 2015 and, with that in mind, have placed Chris Chester in charge of first-team duties initially until the end of the season whilst a full review of all off-field operations is carried out.
"The club would like to thank Craig for all his hard work over the last three years and wishes him well in the future."
Hull KR are currently outside the top eight in the First Utility Super League after winning just seven of their 19 matches so far this season.
Sandercock was appointed as the successor to fellow Australian Justin Morgan at Hull KR in October 2011 after being recruited from Newcastle IKnights, where he was assistant coach.
He was out of contract at the end of the season and was thought to be in talks over a new deal until recently.
Sandercock is the fifth coaching casualty so far this year after Salford, Bradford, Wakefield and London Broncos all made a change in the first half of the season.
Francis Cummins, the most recent departure from Bradford, is being linked with the vacancy.
Hull KR have made their first new signing for next season with the capture of Wigan Warriors centre Darrell Goulding.
The 26-year-old will finish the current campaign with the reigning Super League and Challenge Cup winners before linking up with the Robins for pre-season training in November.
Bradford Bulls' caretaker coach Matt Diskin has promised his side will be "fired up" for tonight's clash with Hull KR.
Diskin has been left to pick up the pieces following the Bulls' crushing 46-18 defeat at Salford last Sunday and the subsequent sacking of head coach Francis Cummins and his long-serving assistant Lee St Hilaire.
Victory against the Robins is a must if Bradford are to keep alive their slender hopes of avoiding relegation from the First Utility Super League and Diskin believes the players are ready for the fight.
"We are smarting as a group and are desperate to respond," the former Leeds hooker said.
"With that in mind, I believe our supporters can expect to witness a fired-up Bulls team tonight. I think it goes without saying that we have only one aim."
Not surprisingly, Diskin has selected himself and, after expressing his dismay at the latest turn of events and agreeing reluctantly to step into the breach, he has thrown himself wholeheartedly into his first coaching experience.
Hull KR have recalled full-back Greg Eden from his loan spell at Salford after losing his replacement, Ben Cockayne, with a serious knee injury.
Cockayne, who has made a successful switch to full-back from the wing, is set to be miss most of the rest of the season after picking up the injury in Sunday's 54-12 defeat at Castleford.
Eden has made five appearances for the Red Devils and, although his initial one-month loan spell was extended, Rovers retained the right to recall him at any time.
Hull KR's heavy defeat at Castleford proved particularly costly, with prop Michael Weyman sent off and subsequently banned for two matches for abusing the referee and second rowers Kevin Larroyer and Jordan Cox both sustaining fractured ankles.
Hull KR have announced that forward Jordan Cox has signed a new two-year contract at the KC Lightstream Stadium.
The prop or second rower, who turned 22 this week, follows fellow Academy graduates James Green and Macauley Hallett in committing himself to the First Utility Super League club this month.
Rovers coach Craig Sandercock said: "It's really important as a club that we keep hold of our homegrown players and it's great that Jordan has committed to Hull KR for the next two seasons at least."