Manchester United playmaker Juan Mata must accept a pay cut to join Barcelona this summer, reportThe Sun.The Spanish schemer is out of contract in June and looks set to depart Old Trafford after failing to agree a new deal.Barcelona are among the clubs keeping tabs on Mata's situation, but they are unwilling to match his current £170,000-a-week wages.The 31-year-old will therefore have to accept a lower salary to move to the Camp Nou, although theBlaugranacould top up his earnings with bonuses and a sizeable signing-on fee.Mata scored the opening goal in United's 1-1 draw with former employers Chelsea on Sunday.He has made 217 appearances and scored 45 times since joining the Red Devils for £37.1m in 2014.The ex-Valencia man has also won the FA Cup, the League Cup and the Europa Leagueat Old Trafford , but his time at the club looks to be coming to an end.READ MORE...5 things Manchester United must do to move forward as a clubAndy Mitten column: Something is clearly wrong with David de Gea – but dragging contract negotiations are on him