Fielding limitation

At the instant a ball is delivered there must be no more than two fielders situated at the striker's end behind the popping crease on the leg side of the playing area. The wicket-keeper does not count as one of those two permitted fielders. The penalty for transgression is that the umpire at the striker's end will call and signal a No ball. When the Law says there shall 'not be more than' two fielders behind the popping crease, it means just that! Even if just the toe of a third fielder's boot is behind the popping crease - and the crease is deemed to run right across the playing area - a No ball should be awarded.