Who is Umberto Ferrara? Controversial fitness trainer returns to Jannik Sinner’s team
The past twelve months of Jannik Sinner’s career have been embroiled in controversy, and the world No 1 is now at the centre of another decision raising eyebrows.
Just weeks after the Italian parted ways with fitness trainer Marco Panichi, the four-time Grand Slam champion has now made the surprise decision to hire Umberto Ferrara.
Ferrara previously worked with Sinner but was fired last year alongside physiotherapist Giacomo Naldi, after their role in the world No 1’s controversial doping saga – making his return to Sinner’s entourage all the more surprising.
Here, we look at who Ferrara is, his role in Sinner’s doping case, and why his unexpected return is such a surprise.
Who is Umberto Ferrara?
A hugely experienced fitness trainer, with a degree in pharmaceutical technology, Ferrara was first hired by Sinner in 2022 – joining his team at the same time as Simone Vagnozzi, who remains the Italian’s lead coach.
Sinner reached the quarter-final of three out of four Grand Slam events in 2022 and then, improving technically and physically, surged up the ATP Rankings in 2023.
The Italian ended the year as the world No 4 and had reached his first Grand Slam semi-final at Wimbledon, alongside winning his first Masters 1000 title at the Canadian Open.
Ferrara was an integral part of Sinner’s success and was front and centre of the 23-year-old’s stunning start to the 2024 season, which saw him lift his first Grand Slam title at the Australian Open.
Sinner would win further titles in Rotterdam, Miami, and Halle with Ferrara in his team, though no one knew that a major controversy was brewing behind the scenes.
Role in doping case
Ferrara’s knowledge of pharmaceuticals was a key factor in Sinner’s decision to hire him, and the fitness trainer reportedly oversaw his players’ anti-doping compliance.
However, Ferrara and Naldi found themselves front and centre of the world No 1’s doping case, a saga that split the tennis world when it emerged last August.
The investigation conducted by the International Tennis Integrity Agency (ITIA) claimed that Ferrara had given Naldi trofodermin, a spray for the physiotherapist to use on a cut on his hands.
It was claimed that Ferrara had warned Naldi that the spray contained clostebol, a prohibited substance, though he was allegedly aware Naldi often treated Sinner without the use of gloves.
Sinner would then twice test positive for clostebol in March 2024, once during and once shortly after his Indian Wells campaign.
The Italian was able to successfully appeal against a provisional suspension on both occasions and was able to keep playing throughout the spring and summer, without news of the tests being made public.
The case was first made public the day after Sinner lifted the Cincinnati Open title in August 2024, with the ITIA report clearing the world No 1 of wrongdoing.
He was found to have been of “no fault or negligence” for his two failed tests in the report, with blame placed on the “negligence of members of his entourage” – notably Ferrara and Naldi.
Both Ferrara and Naldi were sacked by Sinner almost immediately after the report was compiled, with Sinner claiming he was not “confident” about having them in his team.
“Now, because of these mistakes, I’m not feeling that confident to continue with them,” said Sinner, ahead of the US Open.
“I was struggling a lot in the last months. I was waiting for the result. The only thing I need right now is some clean air.”
Sinner would go on to triumph at the US Open in 2024 and at the Australian Open in 2025, though was ultimately banned for three months after settling with the World Anti-Doping Agency, who appealed the initial ruling in his case.
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Ferrara’s response – and return
Despite his key involvement in one of tennis’ biggest controversies in recent years, Ferrara did not spend too much time away from the game.
Since his initial split from Sinner, he has been working with another Italian player, former world No 6 and 2021 Wimbledon finalist Matteo Berrettini.
Ferrara broke his public silence about the case in April 2025, claiming to have been “hurt” by the affair.
“With hindsight, it’s easy to say that I wouldn’t do the same things again, said Ferrara, in an interview with La Gazzetta dello Sport.
“I certainly wouldn’t rely on the behaviour of others. I was hurt by the superficiality, sometimes aggravated by bad faith, with which many people treated my position in the affair.”
Following his split with Panichi and physiotherapist Ulises Badio earlier this summer, Sinner did not have a personal fitness trainer or physio during his ultimately successful Wimbledon campaign.
It was expected that the world No 1 would make a quick decision to bring someone into his team ahead of his US Open title defence at the end of the summer.
However, few would have predicted that Ferrara, a man initially held at least partially responsible for his case, would return less than a year after being fired.
Sinner, who has withdrawn from the upcoming Canadian Open in Toronto, is yet to publicly comment on Ferrara’s return.
However, a statement released by his team on Wednesday highlighted the “important” role Ferrara had played in the world No 1’s career.
It read: “Umberto has played an important role in Jannik’s development to date, and his return reflects a renewed focus on continuity and performance at the highest level.
“The decision has been made in alignment with Jannik’s management team as part of ongoing preparations for upcoming tournaments, including the Cincinnati Open and US Open.”
All eyes, and ears, will now be on Sinner’s reasoning regarding the decision to bring Ferrara back into the fold.
However, this is undoubtedly a hugely controversial decision, and one that will bring renewed attention to the Italian’s case.
