Ole Gunnar Solskjaer has called for clarity on the new handball rule after a weekend of decisions that outraged managers and fans.
Crystal Palace and Tottenham were both victims of harsh penalty decisions due to the new ruling, and Manchester United were also on the receiving end in their opening game of the season when Victor Lindelof was penalised.
The rule, which was tightened up by the International Football Association Board (IFAB) ahead of this season, states that if the ball strikes below the bottom of the armpit, whether it is intentional or not, it is handball.