By Matthew Cooper Chelsea boss Mauricio Pochettino has been told he must “make sure that there are no bad feelings” among the squad following an on-field bust-up over a penalty. The Blues thrashed Everton 6-0 at Stamford Bridge on Monday, but there was some controversy after they were awarded a spot kick in the second half. Nicolas Jackson and Noni Madueke both wanted to take the penalty and Chelsea captain Conor Gallagher was forced to step in. Cole Palmer, who had already scored a hat-trick, eventually took and scored the penalty and former Blues winger Pat Nevin has warned Pochettino he has…