The Angels selected Aldegheri's contract from Double-A Rocket City ahead of his start Friday against the Mariners.
Aldegheri will make his major-league debut Friday after splitting his time this season between High-A and Double-A, during which he recorded 134 strikeouts over 95.1 innings. The 22-year-old southpaw was acquired by the Angels in late July as part of the trade package sending Carlos Estevez to the Phillies. Aldegheri will take the spot in the Angels' starting rotation vacated by Carson Fulmer, who was placed on the 15-day injured list Friday due to right elbow inflammation.