Carlo Ancelotti's men welcome mid-table Valenciennes to the Parc des Princes on Sunday knowing they can wrap up the league title if they better second-placed Marseille's result against Bastia 24 hours earlier, while even if both sides win, the Parisians are still in the driving seat due to their vastly superior goal difference.
Alex is aware it will be impossible to ignore Marseille during the build up to this weekend's fixtures, but he is solely concentrating on the three points on offer against Valenciennes.
"Everyone will be looking out for Marseille's result on Saturday, of course," Alex told PSG TV. "But, for us, it doesn't really matter. We just need to get the job done, win on Sunday and be champions.
"There will still be three games left after that so we need to make sure our bodies and minds are prepared for all four remaining games.
"This is the most important game of the season. All the players have been building up to it all week. Everyone is 100 per cent ready because we will need to put in a top performance on Sunday. We know Valenciennes and we have to respect them as a team, but we are at home and we need the three points."
With PSG on a five-match winning run, Marseille coach Elie Baup cannot foresee a drastic set of circumstances that would enable his side to overhaul the league leaders.
"With PSG nine points ahead of second place and the winning streak in which they are on now, the title is theirs. We do not know if it will be (over the weekend) or the next but there is no question, the title is for them," he told reporters at a press conference on Thursday.
Marseille's task of putting pressure on PSG has been made harder by the fact midfielder Benoit Cheyrou and defenders Rod Fanni and Kassim Abdullah will miss out against Bastia, while forward duo Andre Ayew and Andre-Pierre Gignac are doubtful.
St Etienne will look to put the pressure on third-placed Lyon, who travel to Nancy on Sunday night, when they visit Bordeaux in Friday night's only match.
Lille and Nice are just a point behind St Etienne and both sides will be looking to keep their own slim hopes of a Champions League berth alive at Toulouse and Rennes on Saturday and Sunday respectively.
At the other end of the table, Sochaux could move out of the relegation zone with a win over Lorient, Evian, who are only out of the bottom three on goal difference, visit Troyes and Brest - five points adrift of safety - travel to Montpellier on Saturday.
Reims and Ajaccio are both four points clear of the drop zone with four matches remaining and will be hopeful of victory at the Stade Auguste Delaune.