Paris Saint-Germain defender David Luiz had some kind words for Chelsea's notorious striker Diego Costa.

The Brazilian defender will square off against Spanish international Costa in the Champions League Round of 16 second leg encounter on Wednesday and is expecting another tough contest with the affable striker.

"We speak in Portuguese - he is a big friend," the centre-back said.

"Diego is a great player and his style of play is to play with contact, to speak, to intimidate. He tries to get defenders yellow cards.

"For all the match, he is bang, bang, bang. He can hit you on the head during the match and then after the match come and embrace you."