A leading coach has been sent home from the Olympics after posing as an athlete and giving a urine sample in a doping test, the head of the Kenyan Olympic committee has confirmed.

John Anzrah, a former national 400m champion who coaches sprinters, is the second Kenyan official to be sent home for doping-related issues since the team arrived in Rio.

“We have sent Anzrah back home. He presented himself as an athlete, gave the urine sample and even signed the documents. We cannot tolerate such behaviour,” Kip Keino, chairman of the National Olympic Committee of Kenya (Nock), told the Reuters news agency.

Last week Kenya expelled their track and field manager, Michael Rotich, following allegations he requested money to let undercover journalists, posing as athlete representatives, know when drugs testers would come calling. Rotich denies the accusations.

The allegations against Anzrah fall into the category of bizarre rather than malicious. He is long retired, having competed in the 1984 Olympics, and unlikely to pass for a current athlete.

According to sources in the team’s camp, as reported by the respected Kenyan sports journalist Evelyn Watta, Anzrah had been staying in a hotel rather than the Olympic village. He allegedly borrowed the athletes’ accreditation of one of the squad’s middle-distance runners and entered the village, making his way towards the dining area.

Doping control officials had listed the athlete in question for a random out-of-competition test and, as Anzrah was wearing his accreditation, regulations compelled him to give a urine sample.

“It’s a stupid incident, stupid thing really for a coach of his experience to be found in possession of an athlete’s accreditation simply because possibly he wanted to access an area that he may not have had access to because of his credentials as a team official,” the team chef de mission, Stephen Soi, told the Kenyan news site sportsarenanews.com. “Who does that anyway?”

According to reports, Anzrah and several other members of the Kenyan delegation had been staying at a hotel as the team had already exceeded their quota of accreditations for officials inside the Olympic Village.

Soi confirmed Anzrah had reported the matter to team management, who then contacted the International Olympic Committee. “As soon as we realised this we went to the testing officials and presented the runner with his photo ID,” Soi said. “We met afterwards and agreed that the coach had acted irresponsibly, first by taking an athletes’ accreditation and even presenting his samples for testing.”

Accreditations must be worn at all times at Games venues and logistical hubs by athletes, team officials, media and staff. They also act as visas to enter Brazil.

Anzrah had been due to move into the Olympic village once some other Kenyan athletes and officials had departed having finished their events. He will now fly back to Nairobi.Rotich, meanwhile, is in the custody of Kenyan police after allegations in the Sunday Times. He claims he went along with the undercover sting only in an effort to protect athletes.