Yeah he definitely had at least one concussion with Hartford that I remember being reported and then he also missed time with generic upper body injuries and the speculation was it was a concussion. But you know how those injuries are reported now, rarely does a team actually say that's what it is.On his wikipedia page they say of Nieves that his final year he signed with Tampa---would have played for his hometown Syracuse AHL team that year but didn't because of a head injury. I don't know how many concussions he had. He might have had a few though. He could really skate and was also really good at carrying the puck. Decent player defensively. Very little creative play and never scored very much either. He could be a very intelligent person but he was low IQ as a hockey player. His point production underwhelmed at Michigan U., with the Hartford AHL team and with the Rangers whenever he got the chance.