Man Utd boss Ferguson tribute to Hannover keeper Zieler
The German keeper spent five years (2005-2010) in the club's youth and Reserves ranks.
Ferguson said: "Ron-Robert has come on leaps and bounds since joining Hannover and is now a regular in the German national set up. He was always a hard worker and a he's a really nice lad as well. It was unfortunate for him when he was here as he got an injury in the Reserves and was out for about eight months.