Rivalries can run deep - particularly when a World Cup is at stake.
But despite being on opposing sides as they battled it out for a place in the semi-finals, there is still clearly a great deal of respect between Luka Modric and Casemiro.
The former Real Madrid team-mates came up against each other in the midfield contest between Croatia and Brazil in Friday's World Cup quarter-final meeting in Education City Stadium, Doha. And while the game was tightly poised on a knife edge, the pair still found time to swap shirts at the half-time break.
