Argentinian defender Otamendi is valued at £25million. City scout Rob Newman watched the 25-year-old in Porto’s 3-1 win against Sporting Lisbon last Sunday.
Otamendi is also being watched by Chelsea and Manchester United.
French youngster Mangala is rated at £40million and is being strongly linked with the likes of United, City and Chelsea.
Porto are keen on signing United midfielder Anderson on a loan deal in January.
The Daily Star reports that Porto are interested in any deal involving Anderson.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?