Ricco is the third rider at this year's event to test positive for the banned blood booster erythropoietin (EPO).
"We're getting closer to an acceptable situation," said Patrice Clerc, president of Tour organisers Amaury Sport Organisation (ASO).
"This is a message of hope which means we're winning the game against doping."
He added: "We are building the foundations for a new professional cycling and we're closer than ever to achieving it.
"We're winning because we're kicking these people out of cycling."
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New York Times