How about sending Busi a thank you and good bye card and try to get the best out of Frenkie instead of trying to sell him?
FDJ is one of the few players they can generate cash for and in one position have numbers.
It has got to point they either need to build midfield for him or take that cash and get wages off books as not best scenario for anyone.
When see Xavis tactics on his masterclass video there is not a clear role really that FDJ in that set up where would get best from him.
If can use the cash to improve other areas of team lacking more and let FDJ got to somewhere that suits him more could be best all round.
Maybe Man Utd as they have poor midfield and then Ten Hag is an obvious choice in the summer as well.
FDJ is the best midfielder and would be better than Busquets by far at DM but it is not a straight choice between two when one can get a decent fee for.