The former Everton coach was confirmed as the successor to Sir Alex Ferguson in May and has possibly the toughest job in world football to follow his fellow Scot.
His first priority will be sorting out the future of Wayne Rooney, who has been the subject of a bid from Arsenal.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?