Jayden Reid is set for a lengthy spell on the sidelines after suffering another cruciate ligament injury.
The 21-year-old forward missed the whole of last season with the same problem on the other knee and had only recently returned to full training.
Blues boss Danny Cowley said: “It broke my heart when I heard the news because he had worked so hard to get back to a good place.
“He was coming back from a hamstring strain over the summer and it was just an innocuous incident on the grass, with nobody near him.
“Jayden’s a great kid and the boys are all rallying around him. He’ll see a specialist and then we’ll go from there.”
Reid said on Instagram: “This is what comes with the sport. There are many ups and downs on the journey to success – it’s just another one I’ll overcome.
“The club, staff and players have been very supportive, making the situation a lot easier for me, which I appreciate.”
We're all with you every step of the way, Jayden 💙#Pompey pic.twitter.com/YMOmGRrJaX
— Portsmouth FC (@Pompey) October 19, 2022