Ole Gunnar Solskjaer and David Moyes will lock horns on Tuesday night as Manchester United and West Ham bid to reach the quarter-finals of the FA Cup.
Moyes, who was sacked by United in 2014 after succeeding Sir Alex Ferguson, will be eager to knock his former side out of the competition and continue his side's remarkable transformation this season into top four contenders.
The Hammers are in terrific form under the Scot and are just one point off fourth-placed Liverpool in the league table, and will hope to maintain their momentum by progressing in the cup.