Arthur Jones will visit a specialist Wednesday as he fights an undisclosed illness that has taken him off the field for the Baltimore Ravens.
On Tuesday, Ravens coach John Harbaugh said the illness is not life-threatening, though he could not offer any timetable on the defensive end's return.
"I'd rather leave an explanation of Art's situation up to Art," Harbaugh said, according to 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.
"It's something I've been told now that they can't tell you how long it's going to be. It could be a week, it could be indefinitely. We don't think it's going to be the second part. He's going to see a specialist here on Wednesday and he can explain to you exactly what it's about, to whatever extent he wants to."
On Twitter, Jones chose not to share specifics of his illness.
Jones entered training camp as a favorite for the Ravens' starting job at right defensive end. He finished last season with 4.5 sacks and 47 tackles, grading out as ProFootballFocus' 18th-best 3-4 end.
Marcus Spears will start in Jones' place when the Ravens began their Super Bowltitle defense Thursday night against the Denver Broncos.
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