Coaches and players have complained that an experimental offside rule being tried out in the Confederations Cup is confusing and hard for referees to enforce. Under the rule, attacking players who do not receive the ball are not automatically offside even if they are standing beyond the last defender. Referees have effectively been given more freedom to interpret whether the player is interfering with play or not -- known as passive offside. Tunisia's veteran French coach Roger Lemerre said on Monday that the rule had only complicated matters and pointed to an incident in his side's 3-0 defeat to Germany to illustrate his point of his view. "Look at the pictures of a free kick taken by Germany, and you'll see that (Michael) Ballack is in front of the goalkeeper and in an offside position. When you know the rule, he is obstructing the goalkeeper's view and for me he is interfering with play," said Lemerre who guided France to the 2002 European Championships.