Britain’s 4x100m relay silver medallist Chijindu “CJ” Ujah was provisionally suspended on Thursday for allegedly breaching anti-doping rules after a sample taken at the Tokyo 2020 Olympics was found to include two illicit substances that help muscle-building.

It came after Jacobs shocked the world at the Games, winning gold in the men’s 100m final and the 4x100m relay.

Jacobs, 26, was seen as the underdog before he powered to his double victory, leading to British media reports highlighting doping cases involving breakout stars in athletics.

He has taken the unfavourable media reports in his stride, saying “they can write what they want”.

“The situation hasn’t affected me that much, I know the sacrifices and blows I went thorough to get here,” Jacobs was quoted saying in the Italian newspaper Tuttosport.

“Instead, I want to enjoy it 100 per cent.

“Having seen the investigation into Ujah I would say that perhaps it’s better [for the British] to look closer to home before attacking others; it made me smile.”

If Ujah is found guilty of doping, Britain’s men’s 4x100 relay team could be stripped of their medals, with Canada upgraded to silver and China receiving bronze.

Ujah, meanwhile, would likely face a four‑year ban.

Jacobs announced on Instagram on Thursday that he would not compete again until 2022, saying he wanted to peak in time for the world and European championships.

“The decision to not compete again until 2022 was not simple, also because I am a competitor and always want to race, but then you realise that Tokyo is a starting point,” the Rome-based athlete said.

“Next year there are important events like the World Championships and European Championships, and I want to arrive there in top form and prove myself.”