Green Bay- Packers wide receiver Jordy Nelson left Green Bay's exhibition game against Pittsburgh in the first quarter on Sunday with a potentially serious left knee injury.
    
Nelson fell to the ground when he tried to cut after making an 8-yard reception on Green Bay's opening drive. He was able to walk off the field but did not return.
    
Nelson caught a career-high 98 passes in 2014 while making the Pro Bowl for the first time.
    
He will be re-evaluated in Green Bay on Monday.