Spain midfielder Rodri admits his side must find ways to mitigate their worrying lack of strikers after a shock defeat to Ukraine on Tuesday.
La Roja's 15-match unbeaten run came to an end in Kiev thanks to a 76th-minute strike from substitute Viktor Tsygankov.
Spain had 72 per cent of the possession, 21 shots overall and forced goalkeeper Georgi Bushchan into eight saves, yet they struggled to create many clear-cut opportunities against their deep-lying opponents.
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Adama Traore, Ansu Fati and later Ferran Torres were lively on the wings, but Rodrigo Moreno was scarcely involved as the centre-forward, while Mikel Oyarzabal, who replaced him just before the hour mark, had only one shot.