"Juventus have never thought about selling Marchisio," Marotta told calciomercato.com. "Not now, not ever.
"In September 2012 the club extended his contract until June 30, 2016, adjusting his salary too.
"I think this is the clearest demonstration of how important Marchisio is for Juventus.
"We would only look at this again if a stratospheric offer, one not in line with the market, was made. But, up to this point in time, that has not happened."