Huddersfield have fast-tracked the arrival of Wales international Chester Butler from Championship neighbours Halifax.
The 23-year-old centre or second rower was due to join the Giants on a three-year contract at the end of the season but has made the move now to help his new club in their battle against relegation.
Huddersfield completed the signing before last Friday's transfer deadline but only announced it on Thursday and say Butler could make his debut against Castleford on Sunday.
Giants coach Simon Woolford said "It made sense to have another player available in the run-in and a fresh face.
"Chester will train today with us and we'll have a look at him in both the centres and back-row area.
"Whilst he'll remain part time to fulfil the promises he's made to his employer, I'm sure we can get enough work into him if we need him to step up and make his Super League debut.
"It will be a challenge for him but it will put some pressure on some of our guys knowing he's there ready to have a crack"
Butler said: "I've trained today and met all the lads and I'm ready to go if Simon thinks I can do a job.
"I had planned obviously to come in later in the year but there is a chance now and I'm happy to work around training and start the process of integrating into the club."