NFL commissioner Roger Goodell said Thursday that if medical experts were ever able to show that medical marijuana could help treat concussions, he would consider allowing players to use it. Goodell's remarks were similar to his recent comments on the matter. "I'm not a medical expert," the commissioner said, via "We will obviously follow signs. We will follow medicine and if they determine this could be a proper usage in any context, we will consider that. Our medical experts are not saying that right now." But the commissioner remains open-minded about future possibilities. "I don't know what's going to develop as far as the next opportunity for medicine to evolve and to help either deal with pain or help deal with injuries, but we will continue to support the evolution of medicine," he said. Goodell was appearing at an event Thursday with General Electric CEO Jeff Immelt to announce 16 winners of the $20 million "Head Health Challenge."