Ken Whisenhunt “hopeful” Zach Mettenberger can return this year

Titans quarterback Zach Mettenberger left Sunday’s game after aggravating a shoulder injury and multiple reports have pegged him as out for the final three weeks of the year because of an AC joint separation. Coach Ken Whisenhunt isn’t ready to throw in the towel on Mettenberger’s rookie year, however. Whisenhunt said Monday that Mettenberger is doubtful…