Kamil Majchrzak has been provisionally suspended by the ITIA ©Getty Images

Kamil Majchrzak has been provisionally suspended by the International Tennis Integrity Agency (ITIA) after providing multiple samples found to contain banned muscle-growth substance SARM S-22.

The 26-year-old is the number two-ranked men's singles player in Poland and provided the samples in question while competing at the Sofia Open in September, the Japan Open in October and the Open Seoul Challenger also in October.

In addition to SARM S-22, one sample also contained a metabolite of ligandrol and two contained PPARA agonists.

Ligandrol has positive effects on muscle strength and hypertrophy while PPARA agonists boost endurance.

They are all classed as non-specified substances on the World Anti-Doping Agency's prohibited list.

Adverse analytical findings for these carry a mandatory provisional suspension.

Majchrzak had an Association of Tennis Professionals ranking of 78 at the time of being tested and the ITIA sent him a pre-charge notice of an anti-doping rule violation on November 30.

He has the right to request that B samples are analysed to see if they confirm the A samples' findings.

While provisionally suspended, he is ineligible to compete in or attend any sanctioned tennis events organised by the sport's governing bodies.

"I have some incredibly sad and difficult news to share with everyone," Majchrzak wrote on Twitter.

"I have tested positive in anti-doping controls during October and November 2022.

"Firstly, I have never, ever, knowingly taken any banned substance.

"At this moment I have no idea what has happened and this is the biggest shock.

"I have started the most difficult fight of my life – the fight to prove my innocence and to return to the sport I love."

Although not confirmed by the ITIA, TVP Poland has reported that there was also a fourth different banned substance in his system and that Poland Anti-Doping Agency head Michal Rynkowski has not ruled out the possibility of a four-year ban.

Majchrzak represented his country at the delayed Tokyo 2020 Olympic Games but was eliminated in the first round by Serbian Miomir Kecmanović.

He appeared in all four Grand Slams last year but was unable to surpass his best performance, which remains reaching the third round of the 2019 US Open.