If you could change one rule in football, what would it be?

In your opinion: What single rule change would make the biggest difference to football?

EXCITING NEWS for AF EXPERTS: 

From today on, we will select some of your most convincing comments and post them here, sharing with all AFers! So speak out what's in your mind, show us your football-related knowledge and be as convincing as possible! You are to be the next AF EXPERT now! 

Reminder: 

1. If your comment doesn't have any convincing reason, it will be removed. 

2. If you try to get hot comments by copying, your comment will be deleted and you will be banned for one day.

Experts of last daily topic: Who has been the worst signing for your football club that you've ever seen?

@raheem_CFC: It's definitely three of them. Ross Barkley, Drinkwater and Bakayoko.

1.Barkely was bought on the back of a long lay off of injury with Everton. He didn't play a game all season but Chelsea bought him only for him to be injured again and couldn't even make the first team. One of the worst signing.

2.Drinkwater is the same with his injuries, he's gotten in the first team a few times but only when a first team player is injured. he's yet to make an impact and he was bought for nearly 30m. what a waste!

3.And there is Bakayoko, the guy that has done so well at Monaco, breaking up play, defending well and scoring goals when necessary comes to Chelsea and is playing like he's just learning football. he can't tackle without fouling his opponent and he's inconsistent, one of the worst signing too.

@PradumnyaFCB: I'll go with everyone's favourite lord douglas. I mean the player was even unknown in his own country. And FC Barcelona bought him for 6 million. It doesn't sound much. But consider the fact that one of if not the most promising Spanish player was available the same time for 4 million. Guess who? "Marco ASENSIO"! So Barca spent 6 million on lord douglas when they said they can't pay 4 million for ASENSIO, And while ASENSIO went on to cement himself as one of the best young players on the planet lord douglas struggled to even find himself in matchday squad. He completely flopped at the club. It still baffles to me why Barca signed him. For me he is worst signing ever.