Cahill: Ryan Mason retirement is heart-breaking Unknown 01:54 It was a clash of heads with the Chelsea defender that left Ryan Mason with a fractured skull and forced him to retire a year later Share this Share on FacebookTweet on TwitterPlus on Google+ Related PostsTwo Weeks Before Start, Japan PM Announces Virus Emergency Throughout OlympicsBundesliga: Manuel Neuer to remain Bayern Munich captain, coach Julian Nagelsmann backs embattled Leroy SaneWatch: Italy Footballers Belt Out Their National Anthem in Euro 2020 Semi-Final; Leonardo Spinazzola Joins From HomeTokyo 2020 Sponsors Cancelling or Scaling Back Booth And Promotional Events After Frustrating DelaysBrazil's Jesus Out of Copa America Final Due to SuspensionTour de France 2021: Tony Martin, who was hit by roadside fan with sign, out after second crash