A late header from the Brazilian served to spare the home side's blushes but PSG is still waiting on the title.
Victory would have made winning a first title in 19 years a formality, but the team was to be denied by a first-half goal from Gael Danic followed by referee Castro’s controversial decision to send off home captain Thiago Silva at the end of the opening 45 minutes.
Alex did head a late leveler for PSG, which at least saved some face by avoiding defeat, even if the team will have to wait at least one more week for the title.
PSG made a nervy start to the game that was capped by the opening goal from Danic after 17 minutes. Vincent Aboubakar was given far too much room to fire a shot at goal. Nicolas Douchez could only parry into the path of the winger, who finished with ease.
To make matters worse for Carlo Ancelotti’s side, Silva was dismissed just before break for a rather benign pull on the referee’s elbow as he tried to get the official’s attention.
It seemed that the home side was to be frustrated, but Alex headed the team level with little over five minutes remaining to save face, and a point, for PSG.
PSG now faces a very tricky trip to Olympique Lyonnais next Sunday as the team attempts to lift its first league crown in 19 years. A win at Stade Gerland will secure the long-awaited title.