Stefanovic declared: "If you ask me who is going to win, I would say Portsmouth.
"I know Harry Redknapp and what his teams are like. They will want to win going into the FA Cup final. We will be lucky to get a point. The players are not bad here. It is a squad which can just about survive, if they are lucky.
"There isn't a lot of quality but we have taken results and our away win at Manchester City was important."
Stefanovic's blast will spell the end of his Fulham career.
Stefanovic, 33, said: "I have not played since the start of the year and will leave in the summer whatever happens on Sunday."