One of the world’s top centre-backs Mats Hummels has made a sly dig at West Ham and Arsenal after the London rivals crashed out of Europe. It has been a difficult week for West Ham and Arsenal after exiting Europe. Both clubs faced German sides in their respective Europa League and Champions League quarter-final ties. Somewhat ironically West Ham had a tougher draw than Arsenal as they faced unbeaten Bundesliga champions Bayer Leverkusen. It’s not often you would say that with the Gunners taking on European giants Bayern Munich. The Hammers lost 3-1 on aggregate despite a valiant second leg ef…