Nigel Clough has ordered his Sheffield United players to forget about their FA Cup heroics and focus on avoiding relegation
Blades substitute Chris Porter struck two last-minute goals to seal a 3-1 win against Nottingham Forest at Bramall Lane on Sunday and set up a possible quarter-final clash at home to city rivals Sheffield Wednesday.
Clough's side had already seen off Premier League sides Aston Villa and Fulham in previous rounds, but the Blades boss said a memorable cup run will count for little if they cannot beat the drop.
"We forget about the FA Cup now," Clough said after his side's fifth-round triumph.
"It's brilliant there is a few more quid in the coffers but the next three league games against Gillingham, Bristol City and Colchester are far more important. They will take priority over everything now.
"The atmosphere was special, 25,000 in Bramall Lane - I don't know when that last happened - but we won't get that in League Two if we don't get out of the bottom four."
Clough revealed he opted to tell his players about the potential Steel City showdown after the quarter-final draw had been made during the half-time interval.
Sheffield Wednesday will host Charlton in their rearranged fifth-round tie next Monday night, after Saturday's game was postponed due to a waterlogged pitch.
"Just before we went out for the second half, (the draw) came through," he added.
"We 'ummed' and 'aahed' for a few seconds and then thought 'what the hell, we'll tell them'.
"A few of them didn't believe us at first so we had a laugh and a joke saying 'no, it's Brighton and Hove Albion or Hull City away.'
"Seriously though, they knew exactly what the situation was. Did it inspire any of them? You'd have to ask the players themselves but it might have had a very small effect."
The Blades, two points adrift of safety in 22nd place in the table, are the lowest-ranked team to reach the last eight of the FA Cup since Cambridge, who were beaten 2-1 by Arsenal in March 1991.