Crawley have beaten Torquay United and AFC Wimbledon in the first two rounds of this season's competition and will be facing a Leeds side that have not won an FA Cup fixture since January 2017.
There is no question that Crawley will enter Sunday's match as the underdogs, but they have been in strong form in recent weeks, winning three of their last four matches.
Crawley have already played twice in this season's FA Cup, beating Torquay 6-5 after extra time at the start of November before recording a 2-1 victory away to AFC Wimbledon in round two.
The Reds actually beat Norwich City at home in the EFL Cup last season, and the team's recent form will have left them in a confident mood, with head coach Yems recently insisting that his side have nothing to lose when they host the Premier League outfit in the third round of England's old cup competition.
The Whites have been the great entertainers in England's top flight this term, recently beating Newcastle United 5-2 and West Bromwich Albion 5-0 but also losing 6-2 at Manchester United.
As mentioned, Leeds have not actually won an FA Cup match since beating Cambridge United 2-1 in 2017, losing their last four matches against Sutton United, Newport County, Queens Park Rangers and Arsenal.
Marcelo Bielsa's side will, of course, be aiming to advance to round four, but it would probably be fair to say that next weekend's Premier League clash with Brighton & Hove Albion will be viewed as a bigger game, with managers across England set to rest key individuals in the FA Cup.
Crawley Town FA Cup form: DLWLWW
Crawley Town form (all competitions): WDWDWW
Leeds United FA Cup form: LWLLLL
Leeds United form (all competitions): LWLWWL
Crawley's XI is expected to have a similar look to the one that started against Wimbledon in the last round, meaning that there are likely to be changes from the side that featured against Bolton in the league on January 2.
Crawley Town possible starting lineup:
Morris; Sesay, Tunnicliffe, Craig, Dallison, Tsaroulla; Hassenthaler, Bulman, Powell; Watters, Nadesan
Leeds United possible starting lineup:
Casilla; Casey, Davis, Struijk, Ayling; Shackleton, Klich; Costa, Hernandez, Poveda; Huggins
We say: Crawley Town 1-2 Leeds United
Crawley are certainly capable of making it a difficult afternoon for Leeds, who have lost to the likes of Sutton United and Newport County in recent seasons. The Whites should have enough quality to advance to the fourth round, but they might have to suffer for long stages of the match.