Mosquera finished second behind Italian Vincenzo Nibali in La Vuelta earlier this month.
BBC: La Vuelta runner-up Ezequiel Mosquera fails drugs test
"It will be a minor punishment or a warning, " said Mosquera, who could face a two-year ban from the sport.
The samples of Mosquera and Garcia Da Pena were tested at a World Anti-Doping Agency (Wada) accredited laboratory in Cologne.
Ezequiel Mosquera and his Xacobeo team-mate David Garcia Da Pena both tested positive for banned substance hydroxyethyl starch during the Vuelta.
She defeated Indonesia's Raema Lisa Rumbewas, who was second in the 48kg class at the 2000 Sydney Games, while Mabel Mosquera of Colombia took bronze.
CNN: Thai gold as Asian athletes excel
Retired truck driver Miguel Mosquera said he remembered the idyllic scene there decades ago, when the river was a perfect place to spend a sunny day.
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