Neither side has looked particularly assured since returning to action earlier this month. The Blades have been especially disappointing, recording successive 3-0 losses following their goalless draw against Aston Villa. It's otherwise been an exceptional campaign for Chris Wilder's men and an FA Cup semi-final appearance at Wembley would be a fitting reward for the progress made prior to the season going on hold.
Mikel Arteta finally registered his first Premier League away win as Arsenal head coach with a 2-0 victory over Southampton on Thursday. Now comes a trickier challenge. The Gunners are battling injury problems, remain on the road and must overcome an opponent with nothing to lose if a record-extending 14th FA Cup crown is to remain within reach.