Brazilian striker Ronaldo will be sidelined for another month with a thigh injury that turned out to be more serious than first diagnosed. The Milan striker is out of action since July 31st after being injured during training. It was thought as a thigh strain and the bosses in Italy were expecting him to be fit for this weekend clash against Siena. Although the 31-year-old player still feels pains and traveled to Belgium then Brazil to get treatment under the supervision of Brazil national team medical staff. It has been reported that the Brazilian doctor was unhappy by the way the former World Player of the year has been treated. "We made a mistake in our first evaluation," Milan medical coordinator Jean Pierre Meersseman told Italian paper Gazzetta Dello Sport. Ronaldo is actually in Rio de Janeiro but it hasn't been decided if he's going to get back to Milan to continue his treatment or remain in Brazil.