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Italy sprinter Lamont Marcell Jacobs has hit back at suspicions of doping after his shock double gold medal triumph at the Olympics game - and said others should 'look into your own house first' after CJ Ujah's failed drug test.

Jacobs was the shock winner of the 100m in Tokyo - setting a European record of 9.80 seconds in the final - and then followed that up with a gold medal in the 4x100m relay.

Last week it was reported that Jacobs' nutritionist Giacomo Spazzini was under investigation by Italian police for allegedly illegally distributing anabolic steroids. Spazzini has looked to take credit for Jacobs' success - giving multiple interviews in Italy claiming how he had positively affected Jacobs' career and helped him reach the pinnacle of athletics this summer. 

Lamont Marcell Jacob has hit back at accusations of doping at the Tokyo Olympics

He also took a swipe at British sprinter CJ Ujah after he failed a drugs test, saying the investigation 'makes him smile' 

Jacobs said he cut ties with Spazzini after first hearing of the allegations, and now insists he is not affected by insinuations he was involved in doping, claiming he 'knows the sacrifices I went through to get here'. 

Ujah, who also competed in the 4x100m relay - playing a key role to help secure a silver medal for Team GB - has been suspended after an alleged doping violation, and Jacobs was keen to take a swipe at his sprinting rival.  

'Doping? The situation has not touched me so much,' he told Tuttosport. 'I know the sacrifices and the blows I went through to get here and instead I want to enjoy it 100 per cent. 

Jacobs said his accusers should 'look into your own house first' amid the probe into Ujah, with the AIU looking into his sample of the anabolic aid Ostarine and S-23

Jacobs - who won the gold medal in the 100m and 4x100m relay - says his success at the Games was down to hard work and sacrifice

'After seeing the Ujah investigation I would say that perhaps it is better to look into your own house first and then attack others. It makes me smile.'

The Athletics Integrity Unit (AIU) said they were looking into the presence in the 27-year-old's sample of the anabolic aid Ostarine and S-23, which aids muscle building.

If the findings lead to a conviction, the relay quartet and Team GB could be stripped of the silver medal they won last Friday.

Jacobs parted ways with his nutritionist Giacomo Spazzini, who is under investigation by Italian police for allegedly illegally distributing anabolic steroids

It comes after Nigerian sprinter Blessing Okagbare was provisionally suspended after testing positive for human growth human before her 100m semi-final, and last week Jacobs insisted these 'controversies do not affect me' after some casted doubt over his 100m victory.

'I have been through disappointments and defeats, but I always got back up and rolled my sleeves up,' he said. 'If I have reached this point, it is only thanks to hard work. They can write what they want.'

Earlier this week the Italian Olympic Committee (CONI) blasted suggestions in the media that cast doubt on Jacobs's victory in the 100 metres, saying the reports were 'embarrassing and unpleasant'.