The Flying Eagles lost 2-1 to their Saudi counterparts in their second preparatory game in Vienna, having drawn to a Freiburg U19 side 3-3 in their first friendly.
Aigbogun rued their profligacy in the final third.
“We were unlucky to have lost against the Saudis,” Aigbogun told The NFF website.
“We created a lot of chances but failed to put them away.
“Our focus will shift to the conversion of opportunities because we want to make an impact at the Fifa World Cup.
“There are a few other areas that myself and my assistants noticed and we will work hard at these when we get back to our training camp in Germany.”