One fan, @OG_Mavrickks, does not think Amorim is the right man for the job, as they posted: "He’s not what the club needs. Just another average unproven manager."
Another user, Arsenal fan @olamijuwon1007 added: "Good he's out of Sporting before we play them in the UCL. Mid table EPL clubs will humble him at Manchester United 😃."
@_FaridKhan believes the 39-year-old has taken a step down, saying: "Amorim leaving Sporting for Manchester United is like leaving your Ferrari to drive Toyota!"
But some users are backing Amorim to succeed. @RomeInTheEast posted: "Let’s go!!!! Let’s dust off the epic failure of Ten Hag and back the new man."
Popular United fan account @UTDTrey turned to rivals Manchester City following the announcement. He said: "I JUST SAW PEP CRYING IN THE CORNER."
And @Specsavers chimed in with their usual joke response, adding: "Welcome to Manchester, Ross Gellar."