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Spain international Juanfran was substituted at half-time in Sunday's home win over Celta Vigo.
Bueno, who helped Uruguay win the South American Youth Football Championship last month, is due to arrive in Barcelona on Wednesday.
Asked whether being diabetic meant there were limits on what he could do, Nacho said he made sure he took care of himself.
Real Madrid captain Sergio Ramos has said it is a "privilege" after he was presented with a special team jersey by club president Florentino Perez.
Eibar moved up to seventh in the La Liga table after recording a resounding 4-0 win over Granada.
Purists may complain, but Zinedine Zidane's experiments with personnel and formation make sense with some grueling games up ahead.