The 32-year-old Swede scored a hat-trick in yesterday's 3-1 win over Nice, taking his tally to eight goals in Ligue 1 and 13 in his last seven matches.
"Does Ibra deserve it? It is not a question of merit or not, you know how these awards are distributed," he told reporters.
"You should see who it's based on: Ronaldo, Messi or Ribery. If Ibra can be added to this list, I'd be happy because he scores extraordinary goals. But in terms of what Ribery has won, you can't do better.
"One thing is certain, regardless of the winner it will be a beautiful Ballon d'Or this year."
The winner of the Ballon d'Or will be announced at Kongresshaus in Zurich on January 13.