United are back in action this weekend when they make the trip to the City Ground to take on Forest. Forest's first game under newly-appointed head coach Sean Dyche ended in a win over FC Porto in the Europa League, but they lost 2-0 at Bournemouth at the weekend.
And despite Forest's struggles, Amorim admits that United are in for a 'tough' match. "I watched against Porto, I watched against Bournemouth, the style of play is similar, with different characteristics," Amorim said.
"I watched one game that we didn't pre-season with Sporting, so to try to understand how he played in that game. It's similar, he can change some characteristics of the players with the talent that they have, especially with Gibbs-White, Anderson, Hudson-Odoi, very good players.
"So we need to be prepared for a different game against Brighton. We had space to play. We are not going to have that space. You need to understand that we are not being the same team away and at home, so we need to improve the way we control the environment. Every tackle is a big moment for the opponent's fans, so we need to play better away.
"We are prepared for a very tough match."