Djokovic secured his berth in quarterfinals after Damir Dzumhur was forced to pull out due to lower back pains at 2-1 down in the second set.
"It's been a hard year for me in terms of injuries, and so I'd prefer to avoid doing anything drastic", he told the media minutes before his intended match against compatriot Fernando Verdasco who will instead face Tunisian lucky loser Malek Jaziri.
When asked about the London finals he added: "I am very sorry but I can not answer you".
"I always believe in myself, but it was highly improbable, considering my ranking and the way I played and felt on the court".
World number three Federer will face Italy's Fabio Fognini, the world number 14, who made the next round when Hungary's Marton Fucsovics withdrew injured.
For Djokovic to surpass top-ranked Rafa Nadal when the next edition of the ATP rankings are released on Monday, he must outlast the Spaniard in the French capital this week.
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Sixth-seeded Dominic Thiem won 6-4, 6-2 against Gilles Simon, beating the Frenchman for the eighth time in 10 meetings.
Federer, 37, who captured his 99th trophy on home ground in Basel last week, will next face Japan's Kei Nishikori who beat South Africa's Kevin Anderson 6-4, 6-4.
It's one of the best sets I have played this year I would say.
For Nadal it means delaying his long awaited comeback from injury which has kept him sidelined since the US Open.
John Isner's hopes of also making the London finals received a blow when he was beaten 6-4, 6-7 (7-9) 7-6 (8-6) in an absorbing, huge-serving battle by rising Russian Karen Khachanov.
Cilic fired 29 winners to advance to the last eight for the third straight year.
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Seeking a record-equalling 33rd Masters and record-extending fifth Paris title, Djokovic will face a much more challenging test in the last eight against Marin Cilic.
"I am very close to London, to securing my spot mathematically", Cilic said.
Nadal, who had been No. 1 since 25 June after several lead changes with Roger Federer earlier in the year, had led Djokovic by just 35 points in the ATP Race To London ahead of the final week of the regular ATP World Tour season in Paris.
He'll be replaced by lucky loser Malek Jaziri.
In the quarter-finals, Khachanov will meet Germany's fourth seed Alexander Zverev, who took 80 minutes to overpower and finally subdue the scurrying defiance of Argentina's Diego Schwartzman 6-4, 6-2.
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Additionally, one of O'Rourke's goals is to seek fruitful conversations that heal communities instead of divide them. He added: "Y'all are gonna get me in trouble with that". "But you are the energy that is driving this campaign".