If you have a severe pull...which I had once I could sprint all out for a long time...it sure was not three weeks.
"If Justin (Gatlin) and Shawn (Crawford) ask me, I will run the relay," said Greene.
Olympic 100m champion Gatlin won the sprint at the US championships with Olympic 200m gold medallist Crawford second.
"I was told by officials I was eligible to run the relay," said Greene.
"My hamstring is still tight, still painful, but I will be OK. I hope to be ready to run in three weeks."