The Portuguese club looked to sign brother Giovani previously, but now appears to be focusing on the current Barcelona midfielder.
The Mexican midfielder has been linked with the Portuguese team that reportedly tried to sign brother Giovani last summer.
Dos Santos, 22, declined a spot in the Mexican Olympic Team in order to fight for a roster spot at Barcelona under new manager Tito Vilanova this summer.
According to Portuguese media, Sporting would look to incorporate Dos Santos on a full-season loan, guaranteeing ample playing time for the budding midfielder.
The younger Dos Santos joined Barcelona as a 12-year-old along with brother Giovani, who was later sold to Tottenham in 2008 after Pep Guardiola took the reins at the Camp Nou.
Since debuting for Barcelona in 2009, he has appeared in eight league matches. With the Mexican national team, he has been capped eight times.
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