Alan Pook is expecting a sell-out crowd for Worthing's FA Trophy showdown with Crawley.
The teams will meet at Broadfield Stadium on January 15 in the third round.
Pook, whose side got through with a 1-0 defeat of Mangotsfield on Saturday, said: "It will be a wonderful cup tie for Sussex football and I would expect it to be sold out.
"All games are winnable but it will be extremely hard for us. It will be a nice change to go into a game as underdogs."
Pook was delighted after their victory over Mangotsfield which came courtesy of a superbly taken Micky Phillips goal.
Pook's man-of-the-match Stewart Holmes was instrumental in the move which led to Ronnie Green setting up the former Gillingham player to rifle in from 20 yards.
Pook said: "I think it is only the way the football pyramid was divided up last season that kept Mangotsfield from becoming a Conference South side.
"They are one of the best teams we have seen at Woodside Road for a couple of seasons. For an away team they had a lot of the ball and we had to go flat out to get the victory."
The victory was marred by a knee injury for striker Sam Francis and Pook fears he could be ruled out for up to eight weeks.
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