Delgado, 21, scored his first international goal as Chile defeated Haiti 1-0 in an international friendly at Lockhart Stadium on Tuesday.
Appearing in just his second match for the Chile national team, Delgado tucked away a rebound from just outside the six-yard box in the 20th minute.
"The goal is a dream achieved, but still cannot get anything because there are many things to improve and contribute," Delgado said post-game.
"I want to keep earning minutes."
Delgado received praise from Sampaoli, who said: "He's a young guy, and score in the senior team is very good."
The result, which ended Chile's three-game winless streak, never looked in doubt but the South Americans were far from their best as travel took its toll.
"We had a very exhausting trip, we complicated the game," he said.
"In the first half we had a lot of chances. [We] tired in the second, we felt weary and could not control the game.
"It became a sloppy game."
