Heaney was placed on the 15-day disabled list Wednesday with a left flexor muscle strain, Jeff Fletcher of the Orange County Register reports.
According to Fletcher, Heaney had a noticeable dip in his velocity during Tuesday's start against the Cubs, which resulted in a loss. A flexor muscle strain is a concerning injury for pitchers as forearm injuries can often lead to more significant problems down the line. He'll be shut down for the time being, and the Angels figure to release a timetable for his return in the near future. The Angels have yet to make a corresponding move to replace Heaney on the active roster. Heaney's placement on the DL is a tough development for an Angels' staff that is already dangerously thin. Nick Tropeano is the leading candidate to take Heaney's spot in the rotation.