One of the greatest assets of one of Manchester United's greatest players was rarely spoken of.
Roy Keane's ability to play to his usual exemplary levels when others around him were struggling was among the many things that has made him irreplaceable ever since.
There were none to match Keane on a good day and not many on a bad day either. That said everything for the Irishman's extreme football talents but also illustrated a mental toughness and fortitude matched by few before and even fewer since.
Really great players maintain standards regardless of everybody else and this is something that Eden Hazard may think about ahead of what appears to be a defining week or so for his Chelsea coach Maurizio Sarri.