CHICAGO -- The Chicago White Sox designated left-hander John Danks for assignment and recalled right-hander Erik Johnson from Triple-A Charlotte in time for Thursday's start against the Boston Red Sox.
They also placed reliever Jake Petricka on the 15-day disabled list with a right-hip impingement and recalled pitcher Tommy Kahnle from Charlotte.
General manager Rick Hahn said Tuesday the White Sox were letting Danks go after 10 years. The 31-year-old went 7-15 with a 4.71 ERA in 30 starts last season, and got hit hard while dropping his first four outings this year.
Johnson -- 1-1 with a 3.74 ERA in four starts with Charlotte -- was with the White Sox from April 19-24 but did not pitch.
Petricka is 0-0 with a 4.50 ERA in nine appearances.