Benitez could make a move for him in the January transfer window, should he fail to sign Javier Mascherano to a permanent deal.
Muntari joined Portsmouth for a club-record £7m from Udinese.
Muntari said: “I want to end up at one of the biggest clubs – that is every player’s dream. Of course I will try my best here and help Portsmouth win many things, and maybe qualify for Europe, but eventually I would like to play for a bigger club.”
