Green was designated for assignment Friday, Dan Kolko of MASN Sports reports.
With Trea Turner (hamstring) returning from the disabled list, Green was the obvious casualty. The 29-year-old received barely any playing time during his short stint with the Nationals, going 0-for-3 in his only start Thursday. Green likely returns to Triple-A Syracuse if he clears waivers, where he should see regular playing time and further chances to hone his skill set.