Valencia are refusing to do business with interested clubs over the sale of Nicolas Otamendi.

A raft of major European clubs are eyeing the Argentine defender, with Manchester United heading the queue.

However, thus far, Valencia have referred all enquiries to Otamendi's €50 million buyout clause.

The centre-half is tied to the Mestalla until 2019.

Otamendi, 27, moved to Valencia last year from Porto.