The Cubs placed Brown on the 15-day injured list Wednesday with a neck strain.
It's unclear when Brown's neck began bothering him, as he showed no apparent issues in his last outing in a win over the Blue Jays. He will be eligible to return in early July, but the Cubs have not yet provided a timeline for Brown's activation. Brown boasts a 1.70 ERA and 41:11 K:BB over 42.1 innings covering eight starts since entering the Cubs' rotation.