"Leo I think makes everyone look better on the field and Leo does so many things for us," Gressel told CBS Sports. "You can get the feeling that when he's on the field there's a different energy about us and there's a different feeling to the group.
"The game against Colorado he came on at half-time and the energy shifted, not only in the stadium with the fans obviously cheering more but also within the group, where he gets the ball, everyone around us is activated. And I think even coaches say that, it makes everyone play at a higher level, even myself.
"Leo's a great teammate, he's a great player. Every day in training he wows me still and it's incredible to see and be so close to daily."