The Angels added right-handers Jaime Barria, Jesus Castillo and Jake Jewell and outfielder Michael Hermosillo to their 40-man roster ahead of Monday's 5 p.m. PT deadline for shielding players from next month's Rule 5 Draft.
The quartet will now be unavailable for selection during the Rule 5 Draft, which will be held on the final day of baseball's Winter Meetings on Dec. 14 in Lake Buena Vista, Fla. The Angels' 40-man roster currently stands at 36.
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Barria, 21, is one of the top pitching prospects in the Angels' farm system after shooting from Class A Advanced Inland Empire to Triple-A Salt Lake this past season. Signed as an amateur free agent out of Panama in 2013, Barria logged a 2.80 ERA over 141 2/3 innings across three Minor League levels and represented the Angels at the SiriusXM All-Star Futures Game in July. He is the Angels' No. 8 prospect according to MLBPipeline.com.
Castillo, who was acquired from the Cubs in exchange for veteran reliever Joe Smith last year, spent most of 2017 with Inland Empire before earning an August promotion to Double-A Mobile, where he made five starts over the final month of the season. Overall, the 22-year-old Venezuelan posted a 3.32 ERA over 124 2/3 innings, with 118 strikeouts and 26 walks, in 2017. Castillo is ranked the club's No. 14 prospect.
Jewell, a fifth-round Draft pick out of Northeastern Oklahoma A&M in 2014, opened the 2017 campaign with Inland Empire but was elevated to Double-A after just three starts. The 24-year-old recorded a 4.84 ERA with 81 strikeouts and 41 walks over 124 2/3 innings at Double-A Mobile in his second full year as a starter. He is ranked the Angels' No. 21 prospect.
Hermosillo, 22, has made a steady climb through the Angels' system after being selected in the 28th round of the 2013 Draft, reaching Triple-A Salt Lake this past season. Ranked the Angels' No. 12 prospect, Hermosillo batted .267 with a .763 OPS, nine home runs and 35 stolen bases in 120 games across three Minor League levels in 2017.

Among the notable players left exposed to the Rule 5 Draft are right-handers Osmer Morales and Damien Magnifico, who are ranked No. 27 and No. 30, respectively, on MLBPipeline's list of top Angels prospects.
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Signed by the Angels as a Minor League free agent last year, the 25-year-old Morales logged a 4.19 ERA with 121 strikeouts and 50 walks over 126 2/3 innings (25 starts) between Double-A Mobile and Triple-A Salt Lake this past season. The Angels acquired Magnifico from the Orioles in May, but the 26-year-old reliever made only one appearance for the Halos and struggled at Triple-A Salt Lake, posting a 6.82 ERA over 34 1/3 innings. In August, Magnifico was outrighted off the 40-man roster and demoted to Double-A Mobile.
Players drafted or signed at age 18 or younger are eligible for the Rule 5 Draft after five Minor League seasons if they are not on a 40-man roster. Those drafted or signed at 19 years or older are eligible after four Minor League seasons if left unshielded. Teams can pay $100,000 to make a selection during the Rule 5 Draft, and they must keep that player on their Major League roster for the entire season or offer him back to his previous club for $50,000.