In Pittsburgh, the performance of the offense has become a major early-season focal point. Despite a healthy smattering of weapons, the performance isn’t there.

And so the questions have come. Is it the play caller, Matt Canada? Is it the quarterback, Mitch Trubisky? Is it the offensive line?

Asked by a reporter on Friday about the comfort level of the offense given the questions about Canada and Trubisky, running back Najee Harris was blunt.