Manchester United is scared if they might enter relegation zone if the manager is still Amorim, but they forget that they signed Amorim because Amorim was successful with Sporting Lisbon.
Manchester United cannot get relegated at this point because the relegation zone is occupied already by three teams that do not look to be improving in their performance. The worst case scenario for Manchester United is that the finish at a very unfavorable position on the Premier League table. Sacking the new coach at this point will be another wrong choice by the management of the club, they should rather give him time and judge his performance from next season when Manchester United will start on a level playing field with other clubs and compete for the premier league.