The 33-year old Jamaican spent last season with the Addicks after six years with Stoke City but was released at the end of the campaign.
He is back training with Charlton this pre-season and Powell says there is the possibility that he may return to The Valley for the 2013/14 Championship season.
"Ricardo was one that I always left the possibility of bringing back," he told the South London Press.
"I don't know about other options that he may have.
"I just shook his hand, told him it was good to see him and he has got on with his training. Maybe there is a conversation to be had."