Erik ten Hag has sent a clear-cut message to Manchester United fans after the Red Devils’ 4-0 drubbing at the hands of Crystal Palace on Monday evening. Michael Olise opened the scoring for Crystal Palace in the first half before Jean-Philippe Mateta doubled his side’s lead before the break at Selhurst Park. Tyrick Mitchell added Palace’s third after the break before Michael Olise, who has been heavily linked with Manchester United, completed his brace in the 66th minute. Erik ten Hag’s men underwhelmed with their performance and United produced a lacklustre display while on the back foot from…