In early December, the Reds travelled to the Emirates Stadium for a midweek fixture in the Premier League and suffered a 2-0 defeat.
Both goals came from corners, in the second half, scored by defenders Jurrien Timber and William Saliba.
While United competed well, head coach Ruben Amorim has since revealed he felt a lack a belief on that night going forwards, which was certainly not the case in the tough away games at Manchester City and Liverpool recently.
The feeling at the time was we would be better equipped to deal with the Gunners in this Emirates FA Cup third-round tie, because Amorim will have had some precious time on the training ground, instilling his methods into the squad.