Spain's exploits without a striker in a 'false nine' formation at Euro 2012 surprised the footballing world despite having the likes of Fernando Torres, Alvaro Negredo and Fernando Llorente in the squad.
Del Bosque admitted that none of the Spanish strikers has impressed him at the moment and revealed that he may resort to the same 'false nine' tactics at the Confederations Cup later in June.
"We'll be playing with a striker, that's quite clear - even if it's a false No.9 or an out-and-out striker. As a rule, every team should play with a No.9 but we haven't found one we all like," he told Diario de la Roja.
"Maybe that's our fault. A few have been given run-outs, Negredo, Torres, Soldado, even Villa hasn't really bowled us over either.
"A striker can spend practically the whole game without having to touch the ball, then he scores a goal and everyone says: ‘Well, anyone could have scored that', but he has spent the whole match without a sniff of the ball.
"We need players up front who participate, ones who are visible and actively taking part during the game".
Bayern Munich midfielder Javi Martinez has had a successful season at club level after winning the treble, but Del Bosque believes the former Athletic Bilbao midfielder is capable of playing even better.
"I've said it many times and I won't mince my words - I think he is capable of giving a lot more, he needs to participate more during Bayern's games and exert more control in his own game. He performed well in the Champions League final and that's something.
"He's also first choice in the team. Whenever we haven't called him, it's been because we haven't liked how he has been playing but there's never been a problem about that because he's a good lad."
Spain face Uruguay in their opening match in Rio on 16 June and Del Bosque is wary of the fearsome strike partnership between Luis Suarez and Edinson Cavani.
"They have two top-level strikers in Cavani and Suarez - two players who are on the agendas of a lot of big clubs," he added.
"Apart from that, they are a very well-organised side who know what they are doing from defence to attack. They are hard-working and tough, they're not the kind of team to lose their nerve."