Last meeting: We bade a fond farewell to Sir Alex Ferguson the last time these two sides met with an astonishing 5-5 draw at the Hawthorns. The Reds were 5-2 up with 10 minutes remaining before the Baggies secured the unlikeliest of comebacks, but with a 20th league title safely in the bag the manager's career still ended on a high note.
The manager: After serving his apprenticeship with stints as coach or assistant manager at Newcastle, Chelsea, West Ham and Liverpool, Steve Clarke stepped up as a number one for the first time when he succeeded Roy Hodgson at the Hawthorns in the summer of 2012. The Scot had a good first season in charge, guiding West Brom to eighth place, their best finishing position since 1981.
Star man: The enigmatic Nicolas Anelka has yet to trouble the scorers since returning to English football this summer, but the experienced French striker certainly has the potential to pose problems for United's defence.
Sub-plot: United fans may choose to remind Anelka about his penalty miss in Moscow which sealed victory for the Reds in the 2008 Champions League final.
Did you know? West Brom have not won at OT since an epic 5-3 win in December 1978, when they were managed by future Reds boss Ron Atkinson. One of the goal scorers that day was the late Laurie Cunningham, who played five times for United while on loan from Real Madrid in 1983.
Referee: Michael Oliver. The 28-year-old Northumberland-based official, who was in charge for the 5-5 last