Roberto, Umtiti more established? They're basically half retired by this point. Roberto never excelled in any position, and in the last 2 years he has become seriously injury prone as well. Braithwaite could maybe do a job for them, but there's zero chance he would accept to move.
Honestly the only way we're ever getting rid of these players, is by releasing them, either by letting their contracts expire or even rescinding their contract, especially in Umtiti's case. Hopefully that no cost release option in 2023 is true, so that we don't have to see him leech off us for another 4 years, while hopefully Roberto's extension really was just an emergency move this summer and we don't extend him further so he leaves next summer as well.
Seeing Roberto, Umtiti, Busquets and Pique leave in the same summer would be glorious. Especially if we get someone like Zubimendi as Busquets's replacement. We already have one for Pique, while Roberto, Umtiti and Braithwaite are already a non factor in this team.
Alba will unfortunately probably stay for one more year, until his contract expires in 2024. I think we will be able to sell Lenglet, but not for more than 15-20M, if even that. Neto will leave this summer, cause he actually wants to play, but for peanuts. While for Braithwaite I don't even know. Shame he still has a 2 year contract, not 1. I thought he'd want to leave this summer to give himself the best chance of starting for Denmark at the World Cup, but seems like he's perfectly happy coming off the bench even there, and in that case he's staying here until his contract expires for sure.