Several Premier League head coaches have spoken out regarding speculation about a FIFA rule change.
A newspaper report this week stated that the idea of blue cards being introduced to football was floated at FIFA.
However, the likes of Jurgen Klopp and Mauricio Pochettino from Liverpool and Chelsea want to hear more before forming an opinion.
"Difficult to express how I feel about the blue card," Pochettino told reporters.
"Difficult to explain. At the moment, we don't have much information about that. That is going to create more debate. It is going to be more complicated. At the moment, my feeling now is it is not a good idea but we will see what happens."
"We should keep it as simple as possible for referees," he said in his pre-match press conference.
"It just makes it more complicated. I have no problem with testing, but doesn't sound like a fantastic idea."