Manchester United chiefs believe the club are in need of a minimum of six signings if they are to catch up to Liverpool and Manchester City, according to reports. The Red Devils take on arch-rivals Liverpool at Old Trafford this Sunday (4.30pm) trailing them by 15 points after just eight matches. Last season, United finished 32 points behind Premier League champions Manchester City and 31 off of runners-up Liverpool. The 20-time top-flight winners’ standards have slipped dramatically over the last seven years, since iconic manager Sir Alex Ferguson retired. The Scot led United to 38 trophies in 26 years, including 13 league titles, but the club have only finished second once in the seven seasons since his exit, when even then they finished 19 points behind City. Ole Gunnar Solskjaer is the man currently tasked with restoring United to their former glories, having played for 11 years under Ferguson, though he has hit some speed bumps. United have won just two of their eight league games so far despite spending over £140million in the summer window on Daniel James, Aaron Wan-Bissaka and Harry Maguire. But according to The Athletic, there is an acceptance within the club’s boardroom that United need another…