Tuson has made five appearances for the Tigers since joining on loan from the Warriors and will now remain at The Jungle on a week by week basis, with Wigan having the right to a 48-hour recall.
Castleford boss Terry Matterson said: “Firstly I’m grateful to Wigan for allowing us to extend Chris’s loan deal. We are getting some of our injured players back and some of our young players are developing well, but Brett Ferres and Michael Shenton are still a few weeks away and we remain without long term casualties Dean Widders and Richard Owen.
“Chris has done a good job for us, he is a good prospect, and he is pleased to be playing Super League. Wigan are happy that he is getting some regular first grade football, so the arrangement is suiting everyone.”
Matterson said: “In Kirk’s case he probably wasn’t going to get too much football in May. I don’t anticipate making too many changes this weekend and unfortunately we have two blanks when the cup is on and he needs to be getting some game time. He will be able to do that with Widnes and be playing at a good standard and we can recall him if need be ahead of the Wigan game at the beginning of June.”