Spain manager Vicente del Bosque commented on the Chelsea striker's performance after netting his first international goal.
Experienced Spain boss Vicente Del Bosque spoke of his relief at seeing Diego Costa break his international duck with a goal in their win over Luxembourg on Sunday.
'We were all suffering,' said Del Bosque. 'We were all pleased for Diego Costa because he has worked hard.
''Now we need to look forward knowing that he will be an important player for us.
''At half time I told him to be calm. We all noticed he was a bit nervous, dissatisfied, as he wasn't finding a way through.
''But when a player has much desire he will always get there in the end.''
Costa, who has a ratio better than a goal a game for Chelsea, hadn't scored in six games for Spain, and the pressure was clearly on him to net his first goal as a mid-week loss meant Spain were in desperate need of three points.
It may have taken Costa over an hour to find the back of the net, but on the 69 minute, his hard work paid off. He struck the back of the net with an incisive finish, after Sergio Busquets' shot hit him in the midriff.
Manchester City's David Silva, Valencia's Paco Alcacer and Bayern Munich's Bernat were also on the scoresheet as Spain won comfortably in Luxembourg.
The striker's first goal will no doubt be a huge lift for the Chelsea frontman, and as is often the case in football, the first goal is the hardest to score.
Now with an international goal to his name, along with his form at Chelsea, the 26-year-old will be a striker all sides in football - national and international - will not want to come up against any time soon.