The Tigers will designate right-hander Joba Chamberlain for assignment, Kurt Mensching of SB Nation and the Detriot News first reported (on Twitter). Anthony Fenech of the Detroit News reports (via Twitter) that lefty Tom Gorzelanny will be designated for assignment as well. The Tigers have since announced the moves, adding that righties Jeff Ferrell and Drew VerHagen have been added to the roster in place of the departed veterans.

Chamberlain and Gorzelanny both came to the Tigers on one-year, $1MM contracts this offseason, and while each looked to be at least a reasonable low-cost roll of the dice at the time, neither has panned out as GM Dave Dombrowski and his staff have hoped.

The 29-year-old Chamberlain has posted a 4.09 ERA with 6.1 K/9, 2.1 BB/9 and a 41 percent ground-ball rate in 22 innings with Detroit this season. Those numbers, on the surface, aren’t entirely unsightly, but Chamberlain has been plagued by the long ball in 2015. He’s yielded five homers in those 22 innings, resulting in an FIP mark of 5.49. (xFIP, which normalizes his homer-to-flyball rate, figures the 4.09 mark is more or less represented of Chamberlain’s talent level this year.) Chamberlain’s in the midst of a particularly poor stretch, having allowed nine runs (eight earned) in his past six innings — a span of eight appearances.

Gorzelanny’s struggles have been even more prolonged. The 32-year-old has totaled just 12 1/3 innings over his past 15 appearances, surrendering an alarming 15 runs, which translates to a 10.95 ERA in that stretch. Overall, he has a 6.75 ERA this season with 7.1 K/9, 5.6 BB/9 and a 36.7 percent ground-ball rate. While he’s proven capable of handling lefties in the past, same-handed hitters are batting .273/.380/.419 against Gorzelanny in 2015. Those numbers pale in comparison, though, to the batting line authored by opposing right-handed hitters: .382/.477/.600.

Both are owed $519K through the end of the season, and neither reliever appeared in enough games to see his incentives kick in. Chamberlain, somewhat notably, was five appearances shy of earning an additional $100K.