The Oakland A’s officially inked their new flame-throwing closer, Trevor Rosenthal, to a one-year deal. The organization had to drop a former top prospect to fit Rosenthal on the 40-man roster.

Outfielder Dustin Fowler was designated for assignment Monday morning. The A’s one-time top prospect came to Oakland in the Sonny Gray trade with the New York Yankees that also netted them Jorge Mateo and James Kaprielian in 2017.

Fowler, 26, jumped up the prospect list as their next big outfielder, clocking in at No. 88 on Baseball America’s top 100 prospect list ahead of the 2018 season. But bad luck had already struck. A ruptured right patellar tendon sustained in his first game trying to catch a foul ball in right field with the Yankees in 2017 derailed his call-up and wound up deterring his path in Oakland.