Excuses cannot continue for 'physically and mentally weak' Man Utd - Roy Keane

Newcastle ran out 4-1 winners on Sunday afternoon. 

Manchester United manager Ruben Amorim at St James' Park. Pic:  Owen Humphreys/PA Wire.

Former Manchester United midfielder Roy Keane said excuses could not continue to be made after watching Ruben Amorim's men slump to a 4-1 Premier League defeat at Newcastle - labelling his old side a "weak team".

Harvey Barnes struck twice in the second half at St James' Park after Alejandro Garnacho had cancelled out Sandro Tonali's opener, with Bruno Guimaraes' late goal adding to United's woes.