UNDATED (AP) — The NFL, Under Armour and GE have together issued a challenge for new engineering to help protect athletes from brain injury.

The group said Wednesday that it would award up to $10 million for new innovation and materials that could protect the brain from traumatic injury, as well as new tools for tracking head impacts in real time. It is the second of such challenges from the trio.

The move comes as the issue of concussions in football has taken center stage.

Meanwhile, three former college football players are suing the NCAA, saying it failed to educate them about the risks of concussions and did not do enough to prevent, diagnose and treat brain injuries. Chris Walker and Ben Martin, who played for Tennessee from 2007-2011, and Dan Ahern, who played for North Carolina State from 1972-76, filed a class-action lawsuit in federal court in Chattanooga, Tenn.