There might not be a Polamalu in the NFL anymore ... but there could be one in WWE rings soon -- 'cause TMZ Sports has learned Troy Polamalu's nephew, Talati Polamalu, is trying out for the wrestling org!
The younger Polamalu -- who's currently a rising senior offensive lineman at Georgetown -- hit Nashville this week to showcase his stuff for WWE execs (including Triple H, Big E and Paul Heyman!) in the days leading up to this weekend's SummerSlam event.