November 20, 2015

PHOENIX (AP) The Arizona Diamondbacks have added three prospects to their 40-man roster and designated right-hander Allen Webster for assignment.

Outfielder Gabby Guerrero and right-handers Jake Barrett and Matt Koch were placed on the roster Friday.

Guerrero was acquired in a June trade with Seattle that included outfielder Mark Trumbo and left-hander Vidal Nuno. Guerrero is playing in the Arizona Fall League for top prospects.

Koch, acquired in an August trade with the New York Mets, went 5-8 with a 3.20 ERA with Double-A Binghamton and Mobile last season.

Barrett was 4-3 with a 4.58 ERA with Mobile and Triple-A Reno.

Webster went 1-1 with a 5.81 ERA in nine games during his only season with Arizona. He spent the previous two seasons with Boston.

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