Real Madrid No2 Aitor Karanka insists there's no problem with opposition coaches.

Jose Mourinho clashed last week with Atletico Madrid assistant coach Mono Burgos.

Karanka said: "These things happen in the dugout. Trainers have been sent off and we haven't had any of that. The other day, in the derby against Atlético, we didn't do anything and you can see that in the footage."