Everton boss Ronald Koeman has hit out at Dutch ref Bas Nijhuis after defeat to Arsenal.
Speaking with Ziggo Sports, Koeman took the opportunity to respond to Nijhuis after some critical comments last week following their loss to Europa League opponents Lyon.
Koeman snapped: "I think that's very bad.
"That you say things on television to make yourself big. Some things are not said at all, I think that's the worst thing that does not fit in with his role as a referee.
"So I would say: Get back in your box and whistle matches. And do nothing for the rest. But he has to sell a book with a happy face on television. I think it's very low.
"He should do something else."