Manchester City striker John Guidetti sparked controversy on debut for Feyenoord on the weekend.
The Sweden U21 international netted a late penalty in victory over NAC Breda, but also clashed with Donny Gorter.
Guidetti let rip at his opposite number, but insisted afterwards: "I did not intend to offend him. But in the Netherlands apparently I did. These are things I need to start learning.
"In England, for example, it's quite normal to say 'f*** off' to the referee. This vocabulary is so ingrained, almost the same as to someone saying 'hello'. Here it means a straight red card, I've heard. I will watch my words."
