The Dutchman has been linked with a number of clubs across Europe after he recently announced that he would not be committing his future to the Gunners.
"We've made a bid, they've been trying to negotiate with other clubs," the Scot told MUTV. "We have to persevere. Hopefully it comes our way.
"I don't have a gut feeling about it. We can't get a break through with Arsenal. It's hard to know their thoughts."
Ferguson was speaking after his side's friendly defeat to Barcelona in Gothenburg on Wednesday.