Williams has been on Barcelona's radar for some time, with a close call on joining the club last summer. At that time, he decided to stay with Athletic Club.

Williams has a €58 million release clause in his contract, but this clause requires the full payment of the fee, not installment payments.

Several top clubs, including Arsenal, Chelsea, Bayern Munich, and Real Madrid, have expressed interest in signing Williams. According to reports, he prefers to remain in Spain.

Williams' agent and Barcelona's sporting director have held discussions, which has led to a shift in the winger's attitude towards a potential move to the Catalan club.

It remains to be seen whether Williams will ultimately make the move to Barcelona, but the latest development suggests that the possibility is now more plausible.

Williams' preference to stay in Spain could be a deciding factor in his decision, given the interest from various clubs in the country.