Real Madrid star Jude Bellingham's injury could never be suffered by approximately 10 per cent of the world's population, according to a new report.
It was announced earlier this week that Bellingham would miss the first month of the La Liga season after suffering a calf injury.
The issue will also keep him out of England's Nations League fixtures next month, which are interim manager Lee Carsley's first matches in charge of the senior team.
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Taking to Instagram, Bellingham wrote: "Nothing I hate more than missing games but trying to see the positive side and maybe my body is telling me it needs a bit more rest after a busy year.
"I'm very frustrated but I'll be supporting the lads like a fan until I can re-join them again in my best and strongest form."
Real Madrid confirmed in an official statement that Bellingham had suffered an injury to the plantaris muscle in his right leg.
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The plantaris muscle starts behind the knee, and contains a long thin tendon which drops down towards the Achilles.
While it may sound like a fairly common injury on the face of it, it is actually fairly rare - and the differing makeup of our bodies means approximately 10 per cent of the world's population physically cannot suffer the injury.
According to Marca, around a tenth of people do not have a plantaris muscle.
There is a wide debate as to the muscle's actual function, as certain functions are not affected by a plantaris muscle injury.
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But the injury has clearly had an impact on Bellingham, as he will be unavailable for Real Madrid's opening games of the season.
His absence provides a further headache for Real boss Carlo Ancelotti ahead of his side's second game of the campaign against Real Valladolid.
Midfielder Eduardo Camavinga is out with a knee injury, while left-back Ferland Mendy is suspended.
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Long-term absentee David Alaba is still recovering from the serious knee injury he suffered in January, but is now nearing a return. The Austrian was named on the bench for June's Champions League final against Borussia Dortmund, but was not in a position to play any part in the match.