The Angels announced their decision Thursday.
Canning is the Angels' most promising pitching prospect in several years. The 23-year-old Orange County native went 5-6 with a 4.58 ERA in 18 appearances after getting called up in April.
He pitched seven sharp innings of one-run ball in a victory over the White Sox last Sunday, but emerged with elbow discomfort. Canning already went on the injured list for 10 days earlier in August to rest his elbow.
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