Mignolet, who is likely to be back-up to Chelsea's Thibaut Courtois for Belgium at this World Cup, says England have got lots of good individual players.
The Three Lions will first have to come through a difficult group, with both Uruguay and Italy expected to be fierce competition for a place in the last 16 - and Costa Rica expected to finish bottom.
Mignolet told TalkSport: "[They can go] really far to be honest to with you. Nobody is speaking too much about them, so they can prepare themselves [without any pressure]."
"If they can get through the first stage then I'm sure they can build momentum and gain confidence.
"Then they've got the individual players of quality [to do well]. They can go very far in this World Cup."
Mignolet will know a lot of the England squad very well given that his Liverpool team-mates make up a large chunk of the side.
Steven Gerrard captains the Three Lions with Daniel Sturridge set to lead the attack, and Glen Johnson is the first choice right-back. Jordan Henderson is also widely tipped to play alongside Gerrard in the centre of midfield.
Raheem Sterling is also part of the squad, whilst Mignolet will be linking up with Rickie Lambert after the World Cup during pre-season - so he knows a fair bit about what some players in the England have to offer.
It's not all about Liverpool of course, with Manchester United, Chelsea, Southampton, Arsenal and Everton all strongly represented by some quality players.
A lot has been said about England's younger players in the build up to this tournament and the potential surprise element they can bring against other nations with the likes of Sterling, and Everton's Ross Barkley.
If England can get out of a tricky group, one would think they have little reason to fear many of the teams that will remain in this competition.