There are fears Napoli and Algeria full-back Faouzi Ghoulam has fractured his kneecap for a second time.
The 27-year-old has been out of action since November 2017, as he tore his anterior cruciate ligament and then fractured his kneecap during training in February.
According to Radio CRC, there are genuine concerns he may have damaged the same kneecap again.
They claim to have spoken to the Villa Stuart clinic and Professor Mariani, who was worried by the latest tests sent over to him, but wants to visit Ghoulam personally before making a diagnosis.
There are reports the player took advice from an NBA specialist rather than his professional trainer and the exercises prompted his knee to swell up again.
It’s a bitter blow for the Partenopei, who were hoping to either play Ghoulam this season or sell him, with Manchester United strongly interested.