Latos said he lobbied manager Bud Black, but the skipper was concerned that the right-hander was dehydrated and weakened by the illness. Latos said he's feeling better and that'll he'll likely start Tuesday night.
"It didn't make sense for me to pitch a guy who didn't sleep, who was throwing up all night, and when he came in looked white as a sheet," Black said.
Latos was sick on Sunday.
"I had it from when I walked into the clubhouse till the end of the game, then it just felt like something was stabbing me in the stomach," he said. "I had real sharp pains in my stomach. Everything that hit my system was back up almost immediately. It was violent."
Tim Stauffer was set to make the emergency start for the Padres, who have lost 10 straight games and saw their lead atop the NL West cut to just one-half game after the San Francisco Giants beat the Arizona Diamondbacks on Monday.
Stauffer faced three batters in Sunday's 4-2 loss to Colorado.
His only other start this season was also an emergency, May 9 at Houston when Kevin Correia left the team after the death of his younger brother. Stauffer allowed six hits in five innings and left with a 3-0 lead. The Padres lost 4-3 in 11 innings.
On Aug. 21, 2006, Stauffer was hastily summoned from Triple-A Portland to fill in for ailing Chan Ho Park. Stauffer didn't know he was starting that night until he arrived at Petco Park, then went out and retired the first 10 Dodgers en route to a 4-2 victory.
Correia had been scheduled to start Tuesday. If Latos pitches Tuesday, Black said he will stick with rookie Cory Luebke on Wednesday and push Correia back to later in the week.