Gabriel Magalhaes is an absolutely indispensable asset for Mikel Arteta at the back as he continues to marshal the Arsenal backline with aplomb. The Brazilian has played virtually every game for the Gunners over the past two seasons and is hailed as one of the best central defenders in the Premier League. Together with William Saliba – who is also up there with the very best in his position – Gabriel constitutes an integral part of Arsenal’s spine and is a key player for the present and the future. And the 26-year-old has spoken glowingly as Arsenal prepare to take on Southampton at the Emirat…