The wife of Croatia centre-back Dejan Lovren mocked referee Yuichi Nishimura for his performance in the 3-1 loss to Brazil by posting a picture of him wearing a Selecao shirt.
The Croatians felt aggrieved by a number of decisions made by the Japanese official in their 3-1 defeat, particularly the awarding of a 71st-minute penalty as a result of Fred's tumble in the box under pressure from Lovren.
The Southampton man's wife Anita took to social media to make her feelings over the incident clear, posting a mocked-up photo of Nishimura in a Brazil shirt on her Instagram account.
Alongside the image of Nishimura in the style of a Panini World Cup sticker was a still of Ivica Olic's challenge on Brazil keeper Julio Cesar that led to Croatia being denied an equaliser with the score at 2-1.
Croatia boss Niko Kovac has since branded the referee's display as "shameful," while Lovren himself described the penalty he conceded as "a scandal."
Croatia have two games remaining in Group A, facing Cameroon on June 18 and Mexico on June 23.