(Video) Five transfers more acrimonious than Raheem Sterling’s expected Liverpool exit

Mo Johnston – Celtic-Nantes-Rangers, 1989

Johnston was a bonafide Celtic legend before making the move to Nantes for two years in the late 80s, but quickly became one of the most controversial figures in Scottish football when he returned with Rangers. Not only that, in making the switch, Johnston became the first high Catholic player to feature for the Protestant club, reigniting old sectarian hatreds in the process.