Pillar was injured when he made a diving catch and doubled up Tzu-Wei Lin at second to end the third inning of a 6-2 loss to the Boston Red Sox on Saturday. Pillar was diagnosed with a right sternoclavicular joint injury.
According to Blue Jays play-by-play announcer Mike Wilner, the injury was worse than initially suspected.
"#Bluejays trainer Nikki Huffman tells us that Pillar's Injury was an emergency situation. The collarbone popped out, though didn't dislocate, just pushed the ligaments out. Had the collarbone pushed in instead of out, it could have been life-threatening, requiring surgery," Wilner said via Twitter.
Pillar, known for his highlight plays in the outfield, is batting .247 with 37 RBIs and 42 runs in 93 games.
The Blue Jays also placed Lourdes Gurriel Jr. on the seven-day concussion list.
Gurriel was hit in the back of the head by Red Sox starer Eduardo Rodriguez while diving into first base in the sixth inning of the same game. Rodriguez left the game with a sprained right ankle, but Gurriel stayed in after being checked by trainers.
Wilner reports that the team said Gurriel didn't begin presenting symptoms of a concussion until after the game ended.
Gurriel, a rookie, is batting .270 with four home runs and 15 RBIs in 31 games.
--Field Level Media