York are in talks with former Hull and Huddersfield half-back Chris Thorman about a surprise move to Huntington Stadium.
Knights General Manager Ian Wilson said; “We have spoken to Chris and he is keen on joining us as for 2010. We urge supporters to continue renewing season tickets, club memberships and vice president packages for next season to give us the best possible chance with recruitment.
“We are determined to be challenging for promotion next season and I think that the signings we have made demonstrates this. Chris would be a major acquisition for the club and we are doing our best to make it happen.”
Hooker or half-back McLocklan, 22, joins from Featherstone while prop Benson, 24, and winger Rettie began the 2009 season at troubled Doncaster.
Knights head coach James Ratcliffe said: “I am delighted with all three signings. They will add experience to what is a predominantly young team and all three players are more than capable of playing in the Championship.
“Joe will give us direction out of dummy half and also has an excellent kicking game. Alex is a big front rower who i have liked for a couple of years and Wayne is a winger with bags of pace who i’m sure will become a fans favourite.”