While the shot stopper admits his side have the quality to deal with anything that comes their way at White Hart Lane, the 31-year-old knows Leicester can cause problems if they work as hard as Sheffield United did in the Capital One Cup during midweek.
And Vorm has warned his Spurs team-mates that they need to be at the peak of their powers to stand against Nigel Pearson's men.
“You could tell on Wednesday when we played Sheffield United that they gave everything in the 90 minutes and, although we knew beforehand that it was going to be hard, they defended well and we couldn’t break them down,” Vorm said.
“With teams in Britain, there are no easy games and we’ll see that again on Saturday. Leicester again will give their all so it’s going to be tough against them."
Vorm's comments, of course, bare significant weight when you consider how close Sheffield United ran Tottenham. Spurs prevailed through a second-half Andros Townsend penalty but the north London side were hardly convincing.
The Blades outworked them in several departments and Leicester could well be capable of doing the same, having knocked Newcastle United out in the last round of the FA Cup.
Tottenham, meanwhile, are still on course for a cup treble, being one game away from a Wembley final in the League Cup, while they face Fiorentina in the last 32 of the Europa League. Could Leicester, though, end their FA Cup dream tomorrow?