The outlook for McClain to resume playing football remains "positive," according to two league sources with knowledge of the situation.
"All is progressing well with Jameel," one source told The Baltimore Sun. "The injury requires rest."
During a season-ending news conference, Ravens coach John Harbaugh expressed hope that McClain will return, saying, "We're very optimistic about that."
McClain recently indicated that doctors are taking a cautious approach with him and that he'll undergo another magnetic resonance imaging exam.
McClain remains optimistic that he'll eventually be cleared medically to play football again, adding that he's no longer feeling any pain in his back and neck since getting hurt Dec. 9 in an overtime loss to the Washington Redskins.
"Absolutely, that's the goal," McClain said during the Super Bowl in New Orleans. "It's a process. We're going to take another MRI. What we're focusing on is rest. Right now, we're just taking it slow and resting. The doctors talk about what they talk about, but the goal is to be playing next year."
McClain signed a three-year, $10.5 million contract last spring that included a $3.6 million signing bonus with a $3 million base salary for 2013 and a corresponding $4.2 million salary-cap figure.
"I love this game," said McClain, who started 13 games and had 79 tackles to finish third on the defense last season. "I can't get away from it."