Wirtz can only move with contract ending free transfer( if youre broke

) they are negotiating until 2028 maybe even more. Guy costs like 170-200 millions. I doubt Barca have the financial strength to put it on the table anyway currently.
To even entertain the idea you would need to sell few squad players for big money . Vitor Roque maybe 25 mil, Lenglet 5mil?, Frenkie 25- 30mil if youre lucky ( contract is absolutely killer for any deal tbh). So even with all these you'd still need 100 more.
Its interesting to see where he ends up , Im sure Barca won't be alone chasing him, Real would want him just as much. But only with coach change.