Argentina winger, Angel Di Maria, has said that former Manchester United boss, Louis van Gaal is the worst manager he has ever worked under. The 36-year-old has played for clubs like Rosario Central, Benfica, Real Madrid, United, Paris Saint-Germain and Juventus. Di Maria mostly impressed at the clubs, but struggled at United, where he scored just four goals in 32 games during the 2014/2015 season. He has now blamed Van Gaal – who was in charge at Old Trafford from July 2014 to May 2016 – for his tough time in Manchester. Di Maria, speaking in his Netflix documentary ‘Breaking Down the Wall’ w…