Chambers has not yet decided whether to contest his Olympic ban
Dwain Chambers has decided to focus on reviving his sprinting career after his trial with rugby league club Castleford came to an end, BBC Sport understands.
Castleford this week decided not to offer the 30-year-old a contract at the end of his month-long try-out.
Chambers, who served a two-year drugs ban, is now understood to be weighing up a return to competing in athletics meetings at home and abroad.
The sprinter's doping past means he is banned from this summer's Olympics.
However, Castleford's decision could force him to challenge the British Olympic Association's ban on him competing in Beijing later this year.
A BOA by-law prevents athletes found guilty of serious drugs offences from ever appearing at the Olympics, even after they have served their bans.
But Chambers could yet decide to challenge the BOA's by-law 25 in court in an effort to make the Great Britain team.
During his spell with Castleford, the Londoner still had one eye on a return to the pinnacle of athletics saying: "No matter what happens with the rugby league adventure I hope to get the Olympic ban overturned."
Chambers is determined to continue training in order to maintain his position as Britain's number one sprinter.
On his controversial return to the British squad in March, Chambers collected 60m silver at the World Indoor Championships in Valencia.
UK Athletics had been reluctant to select Chambers because of his doping history but had little choice under the rules of their selection policy when he won the trials in February.
However, the UK's governing body have since pledged to tighten their rules which would prevent athletes with doping convictions representing Great Britain.
And the organisers of Europe's top meetings have also agreed not to invite any athletes who have anti-doping violations since 2003 this summer.
While Chambers ponders a competitive return ahead of the outdoor season, he has also expressed an interest in getting involved with education projects and working with young offenders.
Paralympian Dame Tanni Grey Thompson, who is leading a review by UK Athletics of its anti-doping policy, has said she is also keen to speak to Chambers about why he was tempted to take drugs.
The sprinter was banned from athletics for two years after testing positive for the performance-enhancing drug THG in 2003.
After completing his ban, he made his return to major competition in June 2006, finishing seventh in the individual 100m at the European Championships and winning 4x100m relay gold.
But he then signalled his "retirement" from athletics by joining American football team, the Hamburg Sea Devils, only for the European league to be wound up by the NFL.
The Londoner then made a surprise second comeback during the indoor season at the beginning of 2008.