Former United keeper Ron-Robert Zieler is set to feature against the Reds in Saturday's Chevrolet Cup game against Hannover.
It got us thinking about goalies who faced Sir Alex's side after leaving the club during the manager's reign.
From our research, we think EIGHT have done this. They must have been named in a United first-team by the boss and played against the Reds later in their career in a senior fixture (not including substitute appearances).
Could you name them? The answers are in the box on the right. Look out for another poser next Thursday.
Thanks to Andy Slater on Twitter, who mentioned John O'Shea but we're not classifying him as a keeper despite his stint in goal against Tottenham!
More United-based trivia questions: Oldest scorers in Premier League | Internationals at Old Trafford | Old Trafford penalties | England's seven Reds | Alan Hardaker Trophy winners | Scored against United | United stars at European Championship | Goals for England | The name game | Non-appearance at finals
1. Mark Bosnich
2. Roy Carroll
3. Ben Foster
4. Tim Howard
5. Peter Schmeichel
6. Les Sealey
7. Chris Turner
8. Gary Walsh