Costa Rica boss Jorge Luis Pinto has urged referee Ravshan Irmatov to watch out for Arjen Robben’s diving.
The Central American side take on the Netherlands in their World Cup quarter-final this evening.
And the tactician has warned the officials not to let the Bayern Munich man get away with simulations.
“This is one of the most important questions in the World Cup – diving," he told reporters.
“We're really worried about it. I would like the referee and FIFA to watch Robben closely.
“He's one of the three or four best players in the world. I have a website and I analysed him as a player on it – he's amazing.
“But we have to say that there have been mistakes in this World Cup and we're really worried about Robben's diving, which he admitted. He admitted it!
“So I hope that the officials are very careful on Saturday. I urge them to watch out.
“We hope that there are no mistakes so, please, I would like to ask FIFA and the officials to watch out and be careful. This is very important and could have a big impact on the result.”