Alex McLeish will tell on loan striker Mauro Zarate to cut out the diving if he wants to be a success in England.
The Argentine was booked on his full debut for Birmingham against Portsmouth on Wednesday after taking a theatrical first-half tumble under pressure from Pedro Mendes and Glen Johnson.
The yellow card tarnished what was otherwise an impressive performance by the January arrival from Qatar side Al Sadd.
McLeish had asked the youngster to fill in for the unavailable James McFadden and admits that he has the potential to be a big hit in England.
"I need to speak to Mauro about that (the dive)," said the Blues boss.
"It's in the culture of the South Americans, the Latins especially. I need to tell him it's well scrutinised over in this country.
"But I was pleased with his performance. He was exciting at times. It was
difficult for him to come in under the circumstances with James McFadden having missed out the preparation due to his wife having a baby.
"With Portsmouth having such class players at the back, it wasn't going to be
easy. But I thought Mauro acquitted himself well and he's only 20.
"Ideally he needs time to settle in. We probably expect miracles of him but he
will cause teams problems between now and the end of the season."
Zarate's performance at Fratton Park was about the only positive the Blues could take from a disappointing 4-2 defeat which ensured that they remain firmly entrenched in a relegation battle at the foot of the table.
"Looking at the way we played, it was maybe an opportunity lost," McLeish admitted.
"We could have taken something from the game but the end result is that we didn't.
"Most of our rivals around us would have been hoping and praying for that
result but we still have a lot to play for.
"The players showed good character after we had gone 2-0 down early on and
looked as if we might be in for a drubbing. They stayed together and didn't
panic. A lot of teams would have capitulated.
"In the second half we looked a threat when we went forward and the scoreline