Players diving. Is there any way to fix this?

I've got a striker and a right winger constantly get themselves carded for diving.

I'm in the middle of an away match to Norwich, 3rd game of the season, 1-0 up, tight game.. the striker goes and gets a second yellow for diving.

Last season, he missed the FA Cup semi-final because he dived when we were 2-0 up with 5 minutes left against a relegated team. The winger has done the same thing on several occasions as well.

I fine them, and they thinks it is unfair.

I believe it's the hidden attribute 'sportsmanship'. If they're past the point of tutoring there isn't much you can do about it.

My right winger(wide midfielder actually) was in the same category I criticised him in the strongest possible terms in the match conference after every game, but it didn't seem to make much difference. He got double yellow-carded four or five times in three years, I think - but he was in all other respects a great part of the team, so I kept him in. I never tried fining him.

Actually, in my last two seasons I don't think he's done it, so maybe he has learnt?

For stuff like diving, I wish that there were a press conference question about the incident ("XXX was booked for simulation in your last match; how do you respond to the incident?" or something) so that you can express disapproval, especially after the second or third incident.