Sanabria has been turning heads at Nacional despite not even breaking into the Uruguayan side's first team.
The 16-year-old has starred for Nacional's U19s and is the captain of the Uruguay U17 squad.
And this is said to have attracted the attention of La Liga giants Atletico Madrid and Barcelona, as well as Liverpool.
Spanish newspaper Marca claims Atletico are keen to register their interest in Sanabria, despite currently serving a transfer ban for the next two windows.
The report says the La Liga side have made an agreement with Nacional whereby the teenager could join them as a 'guest'.