By Tom Victor Ball boys and ball girls at Premier League matches will now all be required to stop throwing the ball back to players, amid fears home teams could receive an unfair advantage over their opponents. Previously, there had been instances of the youngsters receiving balls thrown to them, allowing home sides to restart play quicker than the visitors. The multi-ball system used by the Premier League since 2022 had been designed to help stamp out time-wasting, but now there are concerns about an unfair playing field. ‘Ball assistants’, as they are now known, have been at the centre of in…