Third-ranked Federer said he injured his back in Montreal, where he lost in the final to Germany's Alexander Zverev.
20-year-old Alexander Zverev halts Roger Federer's win streak at 16.
Roger Federer outclassed Roberto Bautista Agut in straight sets to inch closer to his sixth title of the season.
The Canadian teenager spoilt Rafael Nadal's chances of returning to world No 1 after defeating the Spanish great in the Montreal Masters quarter-finals.
Roger Federer attributed his renaissance to rediscovering full fitness after knee surgery in 2016 and taking a two-month break from the game earlier this year.
Federer, on Sunday, won a record eighth Wimbledon title and became the tournament's oldest champion with a straight-sets victory over injury-hit Marin Cilic.
Victory was also the 35-year-old's 19th grand slam title, which takes him four clear of Spaniard Rafael Nadal, and he toasted his second major of 2017 at the traditional champions' dinner with women's champion Garbine Muguruza - followed by a trip to a bar with friends and family.
Roger Federer climbed to No 3 in the latest ATP singles rankings while Karolina Pliskova topped the WTA charts despite never having won a Major.
Women's singles champion Garbine Muguruza asked 19-time Grand Slam winner Roger Federer to dance at the Wimbledon Champions' Dinner.
Marin Cilic explained that his tears at 0-3 down in the second set were more a result of his disappointment at not being able to perform at his best rather than a legacy of the pain.
Roger Federer won his eighth Wimbledon crown without dropping a set.
Roger Federer's eighth Wimbledon victory earned him his 19th overall Grand Slam as wishes poured in.
Federer not only surpassed all other male Wimbledon champions with his eight titles but became the oldest Wimbledon champion in the Open Era.
The emotional 35-year-old, who now has 19 Grand Slam titles, is the oldest man to win Wimbledon in the Open era
Roger Federer claimed his 19th Grand Slam with a 6-3, 6-1, 6-4 win over Croatia's Marin Cilic.
Wimbledon 2017 Men's Final Highlights: Roger Federer won a record eighth Wimbledon title and his 19th Grand Slam title with a 6-3, 6-1, 6-4 win over Marin Cilic.
Roger Federer is seeking his record eighth title at the All-England club and has beaten Marin Cilic six times out of seven, but the last two meetings have been complicated.