In June, I have published a brief news about the possible sale of portuguese frigates to the authorities of Montevideo (look here). Recently, the same contact has informed me that the local press has noticed that, during the visit of the President of the Republic of Urugay in Portugal, in September, the acquisition will be announced.
The authorities in Montevideo have not annouced this fact yet, but that is normal even in the case of weapon systems bought second handed from other countries. In fact, the information about any acquisition is only given after the conclusion of the negociations and the signature of a formal agreement.
According to portuguese sources, the two frigates from João Belo class (similar to the french Commandant Rivière) could be transfered to Urugay by the end of this year - and will not have the AN/SQS-510 sonar.