Lacy has been getting first-team reps at training camp, but that doesn't mean he is the favorite to start Week One at home against the San Francisco 49ers.
"I'm excited to see when DuJuan Harris comes back because I view him as our starter," McCarthy told USA Today Sports. "I want him to get back in there and earn it like he did all of last year. He made an impact in our offense."
Green Bay running backs last season only averaged 3.9 yards per attempt. They also have veteran James Starks and rookie Johnathan Franklin on the roster competing for snaps.