Strop, 31, suffered the injury attempting to field a ground ball in the eighth inning on Wednesday against the Angels. The right-hander has posted a 2.89 ERA with a 56/13 K/BB ratio in 43 2/3 innings.
Normally, losing a reliever of Strop’s quality would be a big loss, but the Cubs acquired Aroldis Chapman, Mike Montgomery, and Joe Smith ahead of the August 1 non-waiver trade deadline. They have plenty of bullpen depth to withstand Strop’s absence.
Six weeks would put Strop’s return date around mid-September. It’s entirely possible the Cubs will have the NL Central wrapped up at that time.