The Red Devils' miserable season continued as they were knocked out of the FA Cup on penalties by Fulham on Sunday (02.03.25) and the former United captain has suggested that Amorim should focus on the short-term after commenting that winning the league title is the club's primary target.
Rooney - who was working as a BBC pundit for the game - said: "I think it's a little naive to say they're looking to win the Premier League because from where they are now, they're a long way off that.
"I think he'll get time but it's not a free hit because he'll expect more from Manchester United than what we're seeing since he's been in. He says winning the Premier League, how can they compete? To get further up the table, I think that's the next step for them."
However, Amorim hit back at the former United forward and suggested that it is easy to criticise from the safety of a TV studio.
The Portuguese coach said: "[The Premier League] is the goal.
"Being naive is to think we are going to do it this season or be the best contender next season. So I know that in this moment everybody knows everything. I know that and it's really easy - I was a pundit when I finished my career. I know it's really easy.
"Our goal is to win the Premier League. Maybe it is not with me. But our goal, as a club, the board, is to win the Premier League like we did in the past with all the great glories and legends of this club and we will want to do better and we are in a difficult moment. And I'm not naive, that's why I'm here, at 40 years old, coaching Manchester United."