The Dutchman takes charge of his first match in England when the Red Devils entertain Swansea City on August 16.
Van Gaal arrives in England with a glittering CV after winning titles with the likes of Bayern Munich, Barcelona, FC Twente and Ajax fresh from his third-place finish with the Netherlands at the World Cup.
However, despite LVG's evident ability as a top-class coach, Rodgers thinks that the nature of the Premier League could surprise the former Oranje boss, and he outlined that it may take the new United boss some time to adjust to England's top division.
The Guardian quotes the Northern Irishman as saying: “I think what [Van Gaal] will find is the competition in this league will be different from any other league that he’s worked in. In a lot of the other leagues there are one or two teams and those are the teams that are expected to win.
“This is a league where the top team plays the bottom team and on any given day you can lose. You don’t get that a lot in the other leagues. I think the competition will probably take him by surprise and that’s from foreign managers I have spoken to over the years.
“I’ve worked closely with foreign players who have come in and that real physical competitive nature will be different from anywhere else he’s worked before."
United emerged victorious over their fierce rivals on Monday evening in the final of the International Champions Cup in Miami.
Steven Gerrard opened the scoring from the penalty spot for the Merseyside outfit, before second-half goals from Wayne Rooney, Juan Mata and Jesse Lingard gave Van Gaal his first trophy at the helm, and Rodgers has talked up the strength in depth of the Premier League.
“I think it’s going to be really as competitive,” he added. “Last season was great and right the way through there were four or five teams right up there, and then in the closing months it narrowed down a wee bit. The Premier League historically shows that it’s a very competitive league. Man United will want to bounce back, Chelsea will be strong, Manchester City are the champions so they’ll be the favourites."
Liverpool begin their campaign against Southampton on Sunday August 17.