The third-round match between Brighton & Hove Albion and Crystal Palace on 8 January 2018 was the first competitive game in England where video assistant referee (VAR) technology was available, although it was not used.
Referee Jon Moss initially disallowed the goal for offside but he consulted with video official Mike Jones, who told him Nathan Pond's trailing foot was keeping Iheanacho onside.
Craig Pawson became the first referee in English football to watch a video recording at the sideline in the fourth round tie between Liverpool and West Bromwich Albion on 27 January 2018.
Premier League side Arsenal were the defending champions, but they were eliminated by Nottingham Forest in the third round on 7 January 2018.
[11] The draw for the fourth round proper[12] took place on 8 January 2018 at 19:10 GMT and was broadcast live on BBC Two and BT Sport.
Although semi-final participants Tottenham Hotspur were using Wembley as their home ground during the construction of their new stadium, it was designated as a neutral venue for their tie.
Numbers in parentheses next to the match score represent the results of a replay, except for the quarter-finals stage onwards.
Numbers in parentheses next to the replay score represents the results of a penalty shoot-out except for the quarter-finals stage onwards.
The FA Cup Final was required to be broadcast live on UK terrestrial television under the Ofcom code of protected sporting events.