The Cubs have signed 28-year old RHSP Allen Webster to a minor league contract and he has been assigned to AAA Iowa. Whether he will receive an NRI to Spring Training at this late date is TBD.
Webster was the 2008 18th round draft pick of the Los Angeles Dodgers out of Dalton L. McMichael HS in Mayodan, NC, and was at one time rated by Baseball America as one of the Dodgers Top Ten prospects (2009-12) and one of the Top 100 Prospects in baseball 2013-14. He also was rated as having one of the best change-ups and one of the best sliders in the minors at that time. But he was unable to establish himself in MLB 2013-15 after being traded to the Boston Red Sox in the Adrian Gonzalez deal in 2012 and then with the Arizona Diamondbacks after being traded to the D'backs as part of a trade for Wade Miley in December 2014, and he was released post-2015 to pursue an opportunity to continue his career in South Korea.
Webster pitched for the Samsung Lions in the KBO in 2016, before returning to the U. S. and signing a minor league contract with the Texas Rangers a year ago last November. He spent the 2017 season at AAA Round Rock, where he struggled to a 6.79 ERA - 1.66 WHIP - .329 OppBA with 14 HR allowed and 20/44 BB/K in 58.1 IP (12 G - 11 GS).
Webster is out of minor league options should he be added to the Cubs MLB Reserve List (40-man roster) at some point in 2018, but he does not have Article XX-D status and so he would not have the right to elect free-agency if he is added to the 40 and then subsequently is outrighted back to the minors.
Meanwhile he will be competing for a spot on the Iowa Cubs pitching staff, probably in a RP/SP "swingman" role.