A bemused Rio Ferdinand questioned if one Manchester United star was still “on the pitch” during Crystal Palace’s thumping 4-0 Premier League win on Monday evening. Erik ten Hag’s men suffered a crushing defeat on their trip to Selhurst Park, with Crystal Palace outclassing a woeful Manchester United side. Michael Olise, who is believed to be a top target at the Red Devils, inflicted the first blow in the match after finding the back of the net in the 12th minute. Jean-Philippe Mateta doubled Palace’s advantage early in the second half before United-linked Michael Olise completed his brace onl…