Dwain Chambers, the Great Britain sprinter, has been released by Castleford Tigers after an unsuccessful month's trial with the Super League team.

The future remains uncertain for the 30-year-old, who is most likely to either return to athletics or hope his brief stint in the sport has attracted enough interest from other clubs to continue in league. Chambers made just one appearance for Castleford during his unpaid trial, playing 39 minutes of a reserve match against York City Knights before leaving the field with an injury.

The athlete has, however, not given up all hope of a future in the game and is exploring the possibility of playing for another club.

"I am in discussions with other clubs,” Ron Hill, Chambers’s agent, said. “But it’s got to be right from day one. It was all a bit rushed last time. I have had one or two clubs coming to me but it’s got to be full-time.

“Dwain needs six months in the reserve grade and a full pre-season to learn about the game. We know he’s mentally tough and he’s got speed. He has come a long way in a short time and I think what we’ve seen in a month is enough to show there is potential.”

Richard Wright, Castleford's chief executive, said the player had been a joy to work with.

"Many people watched Dwain in the trial game and he has certainly won over some of the doubters and proved that the trial was more than simply a publicity stunt," he said. "During his trial period Dwain has been a joy to have around. His work ethic and professionalism have been exemplary. He has got on well with all members of the club's staff that he has come into contact with and he has been in great demand, proving a popular visitor to local schools. He has also given us a huge media profile.

"I believe that he feels that he has gained from his time with us, so there are no losers. All the club wish Dwain the very best for the future in whatever path he chooses to follow."

Chambers, who won a silver medal in the 60 metres at the World Indoor Athletics Championships in March, has not ruled out a bid to overturn the British Olympic Association's (BOA) ban. He may attempt to compete in Beijing this year and retains hopes of running in the 2012 London Olympics.

Nick Collins, Chambers' manager, said: "Whilst disappointed, Dwain is comfortable with and understands the decision."