Otamendi has a contract until 2022 and his agent says the dream is to round out his career at River.
"Nicolas' wish is to end his career at River, he dies to play there," Martin Sendoa told TyC Sports.
"He is good (in City), he plays more than last year. But if River calls and convinces him ... in June, it could happen.
"No director has called me, they still haven't acted."