Ruben Amorim said Manchester United are facing a "long journey" back to the top after Nottingham Forest recorded their first win at Old Trafford for 30 years.
Forest won 3-2 on Saturday to condemn Amorim to back-to-back top-flight defeats for the first time since August 2022 when he was in charge of Sporting CP.
The result leaves United 13th in the table with just 19 points -- their lowest tally after 15 games since the 1986-87 season.
"We already knew [it would be tough]," Amorim said.
"It will be a long journey but we want to win because this is a massive club.