Chambers set for shock weekend bow

Dwain Chambers has a "good chance" of making his rugby league debut against St Helens on Sunday, according to Castleford coach Terry Matterson.

The controversial sprinter has never played either code of rugby, but reported in at Super League's bottom club on Monday to begin a month's trial and was told he could be in the team to face the Challenge Cup holders at The Jungle.

"He's probably 50-50 at the moment," said Matterson. "We're busted. We only had 17 players against Bradford and lost two more to injury (Mark Leafa and Kirk Dixon) so you do the sums."

He added: "I would say his chances of playing in the first grade are high. We have a gym session on Tuesday and he can lead the way in that."

Meanwhile, Chambers has revealed he is still "optimistic" that he will be able to compete in the Olympics this summer.

Chambers admitted a legal challenge to his Olympic ban for failing a drugs test is "likely."

"We remain optimistic - we can't afford negative thoughts," Chambers told Sky Sports News. "There will be a decision in the next couple of weeks if we want to go forward with a legal case."

Chambers' solicitor, Nick Collins, added: "It's always been a very realistic aim we will be going there (Beijing).

"There's been some very encouraging comments from people outside the BOA (British Olympic Association) saying they have no problem with Dwain.

"We wouldn't take it (an appeal) on if we didn't think there would be a reasonable chance of success. It's likely."