Australian Detroit Lions punter and former AFL forward Arryn Siposs has tested positive for COVID-19.
It is a blow for the 27-year-old rookie who is battling for a place on Detroit's roster ahead of the September start of the NFL season.
Siposs had shown no signs of the virus and was shocked when he tested positive on Wednesday.
"No symptoms, haven't felt terrible or any headaches or coughs or anything like that so it was news to me when I found out," Siposs told the Detroit Free Press.
Siposs played for St Kilda from 2011 to 2015, but repeated shoulder injuries forced him out of the AFL, he joined the Prokick Australia punting academy in Melbourne and landed a scholarship at Auburn University.
The Lions signed him as a free agent after April's NFL Draft.
Siposs was one of five Lions placed on the team's reserve/COVID-19 list on Wednesday.
Players have to pass three tests before they are allowed to enter the Lions' building this weekend for physicals and equipment pick-up.
On-field practices begin August 12.
Siposs is competing against American punter Jack Fox for the Lions' one punting job.
"It's just one of those situations and we'll be all good," Siposs said.
"Nothing to be concerned about.
"We'll get re-tested again in the next few days and I'm sure we'll be fine."