While Keane had his issues with Ferguson near the end of his spell at United, he has never denied the greatness of United's most successful manager.
When asked if the Gunners have an easier task in replacing long-serving Wenger, Keane is quoted by the Express as saying: "I think so. A touch easier.
"There was a lot of pressure on David Moyes going in at United and he didn't get a chance, I suppose enough time, particularly with the recruitment side of things.
"The problems at Arsenal, it's still a great job. A lot of managers out there would love that job and to get them back to competing to win league titles.
"When you look at it, the way it's been the last few years, [there has been] a lot of frustration from the supporters, particularly with their league form.
"As brilliant a job he has done for the club, it probably is the right time [for Wenger to leave]."