The skipper of the defending champions is optimistic they will triumph over the lower league team in Monday's game
Effugh revealed that it will be suicidal to think that Crown is not a strong side because they played in the National League last season.
He told Goal.com that there are no small teams in the Federation Cup and Crown will be treated like a giant killer when they lock horns on Monday.
"My colleagues are ready for the game and we are not going to underrate Crown because to qualify from that tough group in Lagos means they are a very strong team.
"This is the Federation Cup where anything can happen so we are going to take Crown like we play in the same League.
"The competition is now in a stage where any mistake can prove so costly.
"We are ready for the team from Ogbomosho. Port-Harcourt is like a home for us now and Crown is coming to meet us where we have taken as our home.
"The first step towards winning the match is not to underrate them and that we have decided to do. I know it is going to be a tough game, but I am optimistic that we are going to triumph at the end of the game.
"We are playing well and everything will work well for us," Efugh said.
Heartland are the defending champions of the Federation Cup after defeating Enyimba 1-0 in the finals last year.