The 35-year-old is out of contract at the end of the season and he has been linked with a move to Everton.
Fergie told The People: “There is no decision on Gary’s future yet because we haven’t discussed it.
“There will come a time when we sit down with the (chief executive) David Gill but nothing has happened yet.
“Gary still has plenty to offer and I think we could probably get another year out of him. He is a great professional.
“His professionalism is borne out by the fact that he missed almost a year and a half of football and has come back.
“He’s 35 and to do that at that age is quite incredible because when you are in your 30s and you get an injury for a long period like that it makes it very difficult to come back but he has managed it.”