Saido Berahino was banned by the Football Association for failing a drugs test while at West Brom in September, according to reports.
The striker recently completed a move from the Baggies to Stoke for a fee of £12million and made his debut against Everton on Wednesday evening.
However, the Daily Mail claims that the 23-year-old ‘tested positive for a recreational drug in an out-of-competition test’ during his time at the Hawthorns.
Berahino’s last first-team appearance for West Brom was back on September 10 2016 before he played for the under-23 side on September 20.
It was another three months until Berahino represented the Baggies when he featured for the under-23 team on December 12.
At that time, there were claims the striker was struggling with weight issues, while manager Tony Pulis admitted the striker needed to “get his act together”.
Stoke are understood to have been fully aware of Berahino’s circumstances before completing the move with the ban coming to an end before his transfer.
The report continues by saying that Berahino has claimed that there were ‘extenuating circumstances’ surrounding his positive test.
The news has only just been revealed as the FA have a policy of not naming players guilty of doping offences involving recreational drugs as it is not breaking World Anti-Doping Agency Code.
Berahino’s career has stuttered in the last couple of years since he was linked with a move to Tottenham, scoring only seven times for West Brom since a move to White Hart Lane collapsed.
Two months ago he spoke to the Baggies’ official website, saying: “This last year has been the most difficult of my career and it has left me short of the form and fitness required for the Premier League.
“I have never been a player who lacked confidence or a belief in himself but that has been where I have found myself and it has hit me hard. It has left me feeling depressed and struggling for focus which has made it even more difficult to regain full fitness. I want to thank the club for their support throughout what has been a period of turmoil for me.”