The Red Devils host Manchester City at Old Trafford on Saturday and Fellaini suggests that the inclusion of Jose Mourinho and Pep Guardiola as managers and the addition of some big names such as Zlatan Ibrahimovic, Paul Pogba, John Stones, Claudio Bravo and Nolito has given the contest even more spice.
"Everyone wants to play these games, it's a big game, a derby and everyone in the world will watch this game so it is an important game for both teams," the midfielder told Sky Sports.
"When you play against Liverpool and City the tension is there but I think it is very big this season because there are new managers and players.
"A lot of players have come to this country this season, as too have a lot of great managers so this season it's special.
"There will be a lot of challenges, the crowd will be behind us so it will be a good game.