But he was quick to add: "Who's to say that won't change in January?
"The club have resisted, and rightly so, even though there were some big, big offers.
"Keeping Connor was a message to the supporters. It was a plus, absolutely."
England Under 21 boss Stuart Pearce admitted last week that he has been keeping tabs on the powerfully-built Wickham.
But Keane said: "Hopefully he's got too much sense to notice that praise. He certainly hasn't changed - he's not driving a Bentley yet. When he comes into training in the Bentley I'll be worried."