The 20-year-old Frenchman is likely to be the main target of top European clubs this summer and reports in Italy claim that Paris Saint-Germain are willing to offer Juve up to 70million euros to acquire him.
Pogba, who joined Juve from Manchester United in 2012, has two years left on his current deal and the Italian giants are keen to tie him down to a new long-term contract.
"Paul is a player who has an immense value," Marotta said to Sky Italia. "We are very proud to have him with us.
"We haven't spoken to anyone about him.
"Pogba has established himself here (at Juve) and this is his natural habitat.
"He can stay here for many years to come."
Pogba has scored six goals in 26 league appearances to help Juve remain on course to win their third straight Serie A title.