We know from reports that Xavi has held interest in Lo Celso, Guido and Aleix Garcia.
Only Guido would be attainable in the winter market I think, though he is someone who should have been targeted before Romeu. Especially with the flow of deals between Betis and Barca.
Still, he is a short term solution and will help defensively but not in ball circulation.
Don't know who Deco would go for, his picks themselves so far seem to be young, unproven and in need in adaption.
Not including Roque in that because that seems to have been a long term but of the whole SD, but the likes of Guler, Moscardo, Darvich, Fresneda.
Can see it being another Mendes cast-off, if anyone, unfortunately.