Captain Michael Shenton says Castleford Tigers' off-season recruits have already shown quality during the preparations for the 2015 season.
The exits of Craig Huby, Daryl Clark, Jamie Ellis and Weller Hauraki have been tempered by several new signings.
Melbourne's Ben Roberts and Junior Moors, Bradford's Luke Gale and Scott Moore, Denny Solomona and Mike McMeeken from London joined Daryl Powell's side.
"They've all really added something to the team," Shenton told BBC Sport.
"We've had to get in a lot of rugby sessions to get the new guys used to the way we play.
"It's not as smooth a transition as we'd have liked but the boys who have come in have been absolutely outstanding.
"They've really applied themselves and bought into the standards that we've set ourselves as a club.
"Everyone's working really hard to make sure we build on last year."
Powell's side begin the Super League season with a home derby against Wakefield Trinity Wildcats on Sunday.
On a personal note, Shenton, 28, was a key part of Castleford's rise to fourth in Super League last season, as well as the run to the Challenge Cup final that ended in Wembley defeat by Leeds.
His reward was a place in the Super League Dream Team along with the departed Clark, and a selection for England's Four Nations squad, culminating in a try-scoring first international appearance since 2010 against Samoa.
"I'm really positive about last year, to be picked on tour is pretty special and I was really happy," added Shenton.
"I got a chance to play, unfortunately didn't play as much as I'd like to but still got the experience."