I saw on the news that Manchester United doesn't have enough money to hire good goalkeepers and that's why David De Gea is the best option for Manchester United.
David Raya is also another player Ten Hag wants to hire him from Brentford. but I don't think they have enough money for it.
I think these are mere speculations because the current market value of De Gea is worth $15k while David Raya is worth $25k, De Gea will walk as a free agent without any cost of finance to Manchester United from any potential club that is buying him while David Raya still has a contract with Brentford, which means they will have to settle Brentford before they can have him and indirectly, they will spend more than that amount. If you now do the mathematics, there is no way that selling out De Gea will cover David Raya's cost of moving to Manchester United, I would accept the faith that Manchester United is done with De Gea and his agent should make a move for him to another good club asap.