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Diego Costa should be retained.
Vicente del Bosque could bring back Cesc Fabregas in place of Diego Costa, who has had a poor World Cup.
That is despite the former's bad attitude in training, which saw del Bosque send him out of the session, per the Daily Mail.
However, del Bosque clearly saw something in Costa's physicality and his fine performances for Atletico Madrid.
To drop him after just two competitive games for La Roja would be a poor decision.
Combining him with Koke should be effective, as the pair has a strong relationship at club level.
Costa needs time to get used to playing in Spain's style.
While he will never be the perfect fit for the current possession-based football, he can change and so can Spain.
It would be foolish not to properly utilise the only world-class striker eligible to play for the country.
Maybe he can net his first Spain goal against Australia, who have a weak defence.