Clinton Morrison did praise Casemiro during the first 15 minutes of the first-half of Manchester United’s clash with Arsenal amid criticism of the Brazilian over the last few weeks. There was definitely a spotlight on Casemiro heading into the clash at Old Trafford after Erik ten Hag’s men had endured a nightmare evening against Crystal Palace on Monday. Of course, Casemiro is not a centre-back by trade, so it is hard to be too critical of him. However, the 32-year-old has been one of the world’s best midfielders for a number of years so it is alarming how poor he has been since arriving at Ol…