Granada fullback Guilherme Siqueira has welcomed big club interest.
A host of clubs including Manchester United, Valencia, Porto and Benfica have watched the player in the past 12 months.
He said: "We know that when the market opens, a lot is said and little is done.
"The only concrete offer so far was from Valencia, but the clubs didn't reach a deal in the end and I stayed at Granada.
"As for the Portuguese teams, they were Benfica and Porto. They watched some of our games last year and I know that the president [of one of them] called the club asking about my situation."