Left tackle Bryant McKinnie and Pro Bowl defensive tackle Haloti Ngata were not on the field for the Ravens' first full-squad training camp practice.
After practice, Head Coach John Harbaugh said McKinnie hasn't reported for personal reasons. Ngata tweaked a hamstring running his conditioning drill.
The more concerning of the two is McKinnie considering Harbaugh said he's not sure whether it will be a long-term or short-term absence from the team.
"He contacted us through a representative," Harbaugh said. "He's dealing with an issue right now. I really don't want to speak for him right now. We'll let him speak for himself on that."
McKinnie, who is generally very active on Twitter, hasn't tweeted anything since July 22.
He was last in Baltimore for minicamp in mid-June, but was held out of minicamp practices so that he could get in better shape.
Harbaugh said on Tuesday that he had his "fingers crossed" that McKinnie would report at his slimmed target weight. Now he'll simply have to await his arrival.
Without McKinnie, the Ravens bumped Michael Oher to left tackle and used Jack Cornell at right tackle with Jah Reid and rookie Kelechi Osemele still sidelined by minor injuries. Harbaugh said Oher is the left tackle until further notice.
Ngata was at the team facility today, but did not go out to the field. It's unknown when he'll be able to practice.
"Haloti tweaked his hamstring a little bit doing the conditioning test," Harbaugh said. "We're going to take it slow and make sure he's OK."