La Roja struggled past Portugal on Wednesday night, needing penalties to overcome their Iberian neighbours following a hard-fought 0-0 draw.
Meanwhile, Italy maintained their status as the tournament's surprise package by defeating Germany 2-1 and Del Bosque admits he has his work cut out in stopping the Azzurri.
"We still have two days for the final match and I have enough time to think who is better for the Spanish line-up," he told Radio Marca.
"Italy has found the perfect midfield with [Andrea] Pirlo and [Daniele] De Rossi and they have a very strong defence. I think they will repeat the same team that beat Germany.
|TWO GOOD FOR ITALY?
|15/2||Spain are 15/2 to beat Italy 2-0 in the Euro 2012 final with bet365|
"Italy and us have led parallel lives, and we must do what is expected of us in a final. We may not have been very spectacular, but we have dominated every match we have played in this Euro 2012."
The former Real Madrid boss also hailed the bravery of his side's spot-kick heroes against the Seleccao, adding: "There were six or seven players who stepped forward knowing that they had nothing to gain, and a lot to lose."
The 31st and final game of the tournament kicks off at 20:45CET on Sunday in Kiev.