Baltimore Ravens head coach John Harbaugh has revealed that defensive end Arthur Jones will be out of action for the near future with an undisclosed illness.
Jones became an integral part of the Ravens' defense last season during their Super Bowl run he as notched up 4.5 sacks.
"I'd rather leave an explanation of Art's situation up to Art," Harbaugh told The Baltimore Sun.
"It's not anything that's like life-threatening or anything like that. It's non-football related.
"We've got to get some tests done to make sure that he's OK. Until the tests come out the right way, he's not going to be able to play."
Baltimore face the Denver Broncos in the NFL season opener on Thursday.
