Over 10 assistant coaches & goalkeeper coaches used to cause loss of training for the week.
Some goalkeeper trainers prefered to keep relatively fewer goalkeeper coaches (as few as five) and relatively more assistant coaches, arguing that the loss in training speed is minimal and the gain in form is worth it. The effects of this choice were not studied.
Research suggested that starting from a 17-year old solid keeper, training with five goalkeeping coaches required only one additional week to reach divine skill compared with training with ten goalkeeping coaches. This information has been posted in the Newbie Conference. (A more precise citation would be appreciated.)
As part of season 42-43's changes, goalkeeping coaches were merged with assistant coaches and do not exist anymore (see "staff changes" part in Faster training next season ).