With PSG currently having 62 points and Brest having 50 points, and Monaco having 49 points, the maximum points Brest and Monaco can achieve, assuming they win all their remaining matches, are 71 and 70 points respectively.

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Since PSG has a lead of 12 points over Brest and 13 points over Monaco, PSG will be champion if they secure enough points to make it mathematically impossible for either Brest or Monaco to catch up.

Therefore, PSG will be champion if they secure 9 more points, as that would put them at 71 points, which would be beyond the maximum points Brest or Monaco could achieve.

Given that there are 7 matchdays left, if PSG keep winning their matches, the team could potentially clinch the title as early as the 32nd or 33rd matchday, depending on results from other teams.