Alistair Overeem is a step closer to ensuring his fight versus Brock Lesnar on Dec. 30 will take place as scheduled.

Per the terms of a conditional one-year license issued by the Nevada State Athletic Commission on Dec. 12, Overeem submitted a urine sample two days later at an accredited laboratory in the United Kingdom.

The sample was subsequently shipped to a Quest Diagnostics facility in Lenexa, Kan., where testing revealed it was negative for all prohibited substances, according to a statement issued by NSAC executive director Keith Kizer on Tuesday.

That test ended a nearly month-long chain of events, in which Overeem left the United States the day the test was first ordered, submitted a blood test instead of the urine test the Nevada commission requires, then submitted a urine sample which was returned to his doctor untested. (MORE>>>)