Summary for those who can't see tweets:
Jonas Giæver @CheGiaevara
SuperDeporte reporting that Eugenio López, Otamendi's agent, and Jorge Mendes spent this weekend in Porto having meetings with two clubs.
They were held on Saturday, SuperDeporte say, one in the morning, one in the evening. The two clubs? Manchester United and Manchester City.
SuperDeporte report that both Manchester clubs are going for Otamendi and will prepare formal offers to present to Valencia this week.
The meetings, held in Porto, was for Mendes and López to be informed on everything possible for negotiations to start with Valencia.
SuperDeporte say that after the meetings the two agents called Otamendi to tell him that a move is close, and bids will come in this week.
SuperDeporte also say that more communication will take place tomorrow (Tuesday) to talk about concrete amounts.
SuperDeporte say that contracts offered to Otamendi, by the Manchester clubs, and also previously by Madrid, PSG and Chelsea have been between €3,5 and €4m a season.
SuperDeporte say that following the call Otamendi celebrated with an Argentine barbecue and partied well into the night in Buenos Aires. Of the participants were one Erik Lamela, SuperDeporte say, alongside several other footballers
SuperDeporte also reiterate that Otamendi is ready to return to Valencia on Friday and he will not force anything. He has told Valencia this. No, there is no mention of what Otamendi would prefer between Manchester City and Manchester United.