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McCourt has promised to plough €200 million into the squad over the next four seasons, yet Tapie remains unsure.
ESPN FC's Alejandro Moreno and Ross Dyer break down this week's Player Power Rankings.
Lionel Messi and Cristiano Ronaldo are set to resume their annual battle for the Ballon d'Or after both were named in the list of 30 nominees.
Brazil international has said he wants to "make his life in Paris" despite interest from Barca.
Diaby, 30, has endured an injury-plagued career since his ankle was broken in a challenge by Sunderland's Dan Smith in May 2006.
After only managing a 0-0 draw with Marseille in Ligue 1, PSG coach Unai Emery said his players have the right to be upset.