Former Louisville offensive tackle and top NFL draft prospect Mekhi Becton is aware of a flagged drug test from the combine and has addressed it with multiple clubs, while still awaiting official notification, a source said.

The 6-foot-7, 364-pound Becton is seventh on Mel Kiper Jr.'s Big Board after running the 40-yard dash in 5.10 seconds at the combine.

It's being stressed that Becton didn't have a history of failed tests in college and does not have a substance abuse problem, the source said.

Teams had been checking in Saturday morning and Becton still has several virtual calls lined up beyond Saturday, according to the source.