Linvoy is currently trying to return to full fitness after a career threatening knee injury which saw him sidelined throughout the whole of last season.
Primus has fallen down the pecking order at Portsmouth and is looking forward to being able to play first team football again.
"It's good. I have a connection to Charlton and I'm also going to be close to my family, and it's a great opportunity for me to play football at a high standard, with a club who have ambitions and are moving forward," Primus told Pompey's official website.



