Spain winger Nico Williams has signed a new 10-year contract with Athletic Bilbao.
The 22-year-old had been heavily linked with Barcelona, while German club Bayern Munich were also speculated to be interested in his services.
His previous deal with Bilbao was scheduled to run out in 2027 but he has now extended his terms with them until 30 June, 2035.
The Spanish club have said, external Williams' release clause, which is believed to have been €62m (£53m),, external has also increased by 50%.
"When decisions have to be made, for me, what weighs most is the heart. I'm where I want to be, with my people, this is my home," said Williams.
Williams has come through the ranks at Bilbao, where his older brother Inaki is also a player, and made his debut for the club aged 18 in April 2021.
He has scored 31 goals in 167 appearances for the club and helped them finish fourth in La Liga last season as they qualified for the 2025-26 Champions League.
Williams also helped Spain win Euro 2024, scoring in the 2-1 victory over England in the final.
This announcement comes after it was understood that Barcelona had agreed personal terms with the forward which led to Athletic fans erasing Nico Williams from a mural featuring him and Inaki.
It is also just over a week after Athletic said they had met with La Liga to find out about Barcelona's "ability to sign players" amid the Nou Camp club's financial issues.
Athletic Bilbao added they had "legitimate interest in accessing the relevant information after FC Barcelona sporting director Deco publicly acknowledged that they will try to sign a player from our first team".
"Deco's statements add to the public statements made by FC Barcelona president Joan Laporta himself, admitting that the Blaugrana club 'is working to be within the 1:1 rule' and that, therefore, it is not currently within the parameters of said rule for registering players."
The '1:1 rule' states that Barcelona can only spend as much as their income and accounts allow, with La Liga calculating a limit based on the club's expected income.
The 10-year contract for Williams continues an increasingly common practice across football whereby more players are being signed to long-term contracts.
In January, Norway striker Erling Haaland committed to a new deal with Manchester City until 2034.
Chelsea are renowned for signing players to long-term agreements and, in August 2024, forward Cole Palmer extended what was already a seven-year contract by two years to keep him with the Blues until 2033.
The Stamford Bridge club has continued to employ this strategy, despite Uefa and the Premier League changing rules in 2023 so a transfer fee can only be spread across a maximum of five years of a player's initial contract.
Previously, Spain playmaker Andres Iniesta signed a lifetime deal with Barcelona when he was 33 in October 2017, although he joined Japanese side Vissel Kobe in 2018.
BBC Sport columnist Guillem Balague
Barcelona have been adamant Nico Williams was still exploring the idea of signing for them, but the problem for them was the financial side.
They have no problem with money in the bank, but they are waiting to hear if they will have to comply with the 1:1 rules. They hoped VIP seats, that have not been built, counted towards income – but La Liga stopped that.
So they do not know if they could register the player and Williams' agent had insisted unless they could guarantee he could be, there was no way of doing a deal unless they put an escape clause.
Barcelona did not want to do that as it would have meant they would lose the fee of more than £50m they need to pay for his buy-out clause. If he could not be registered, he would be able to leave for nothing. It made no sense.
The deal got stuck a couple of days ago. Barcelona started to send negative vibes in the Catalan media while maintaining pressure on Williams through the same press.
Williams has been quiet throughout. Bayern Munich were also interested in him but now he has signed for 10 years with a buyout clause of at least 90m euros (£78m).
This will be a blow to Barcelona, who had said, via Deco, that Williams was a priority, while club president Laporta kept suggesting a big signing was coming.
It is the second time in a year that he has decided to stay put, which makes sense for the player.
