York have re-signed centres Brad Hey and Liam Salter on deals from 2020.
The pair becomes the 18th and 19th players to commit their futures to the club.
Hey, 25, has spent the past five years at the Knights, playing 90 games since signing from Castleford in 2015.
Salter, 26, signed for the club at the start of last season but has over 150 professional appearances to his name after a seven-year spell with Hull KR
York head coach James Ford said: “Brad has continuously displayed a fantastic attitude towards his and the teams development. His commitment and professionalism are of the highest levels and we’re delighted we’ll be getting to coach Brad for at least another season.
“I’m really pleased that we’ve retained Liam, we all enjoyed working with him and deeply respect what he brings to the side. He runs great metres out of exit, generates good ruck speed, runs strong lead lines, hits hard and works tremendously hard in defence.”