So far, not so good. Diego Costa's controversial switch from Brazil to Spain was supposed to give La Roja an added dimension and boost the team's hopes of retaining the World Cup. Three games into his international career under Vicente del Bosque, however, and it hasn't worked out.
The Brazil-born striker is yet to score in international football, having appeared briefly in two friendlies for the Selecao and now in three games for La Roja. Costa cleverly left out a leg to win the penalty which saw Spain take the lead against Netherlands in Salvador on Friday. For the most part, though, he and his team-mates appeared on a different wavelength and his miserable evening ended as he was hauled off with 28 minutes remaining.
It could have been worse. Del Bosque replaced the striker after he had headbutted Dutch defender Bruno Martins Indi and been extremely fortunate to avoid a straight red card.
A dismissal would have meant the 25-year-old being unable to play a part in Wednesday's crucial clash with Chile in Group B, in which Spain are playing for their future in the competition. But as it is, he has a second chance - and he must take it.
Constantly booed by the Brazilian fans, Costa could face the daunting prospect of a second round meeting with the hosts in Belo Horizonte later this month. But Spain have to get there first.
"I don't think he was affected by the jeers," Del Bosque said after the 5-1 loss on Friday, in which his side had been level at the interval. "Spain are behind him. In the first half we created chances through [Andres] Iniesta, Silva and Costa, but in the second half everything changed."
It did - and dramatically so. Now, it must change again.
"It's a dream to be representing Spain in a World Cup in Brazil," Costa claimed a few days before the start of the competition. Unless he steps up quickly, however, it could soon turn into a nightmare.