Sub-plots: Former Reds shot-stopper Ben Foster is back from injury and for any goalkeeper returning to their old club there must be the lingering hope of producing one of those heroically defiant displays. United’s hotshots may have something to say about that, but Foster will need to be at his best if the Baggies are to claim a first win at OT since that epic 5-3 triumph in December 1978.
Whistle-blower: Jon Moss takes charge of his first United game. He made his top-flight debut in January 2011 in the match between Blackpool and Birmingham City. He has refereed 23 matches and awarded three red cards and 67 yellow cards.
Rivals watch: Manchester City face another tricky away trip, this time heading east to take on Norwich City (Saturday 15:00 GMT), while Chelsea visit Everton on Sunday (13:30 GMT).
More: Last time vs West Brom