Watford manager Javi Gracia speaking to BBC Match of the Day:
"Everybody could see what happened, it was a game before that moment and a game after it. The game changed we played a very good first half, defensively perfect, knowing we have options in the second half and in that moment our plan changed and it was difficult for us.
"I think it is offside because when Aguero touches the ball Sterling is offside and he influences it by going to the ball. The linesman says it is offside but I do not criticise the referees and I will not do it today.
"The officials have to explain their decision, not me. I said to him the screen and it was offside, but they try to do their best and make the decision and we have to accept.
"They don’t need a lot of things to change the game because they have a high quality squad, we waited for our moment but it wasn’t enough."