Substitute striker Del Piero said on Tuesday in Dortmund that he demonstrated his ability in Italy's semifinal victory over hosts Germany.
"I've had some criticism recently, but I demonstrated that my desire is as great as anyone else's," said the 32-year-old Juventus striker.
He came off the bench and scored with a clinical finish in the last minute to seal Italy's 2-0 victory.
Piero was privileged to have taken part in one of the 2006 World Cup's most absorbing games.
"It was fantastic to be part of a match like that," said Piero, who came on as an extra-time substitute.
"To win in their own backyard, and there aren't any words that describe what I'm feeling right now." he added.
The Germany World Cup represents a big chance for a player who many had perceived to have underperformed for his country.
Before this year's World Cup, Piero's best moment with the national team remained to be his winning goal against Mexico in the group stage match in 2002.
But his ability to play in a supporting role to the leading striker, or as a wide midfielder, means that he still has much to offer. This versatility in such an experienced footballer can make the difference between winning and losing.
Tuesday's victory proved the veteran's value.