should I sell bonaventura for £50 million...2nd season as ac milan patch 17,3

should I sell bonaventura for £50 million?
Just starting my 2nd season as ac milan patch 17,3, finished 2nd to juve by a point.

already got a 30 million transfer kitty, but could be 50 million if i sell him (club only allows so much of transfer revenue)

and who to replace with? can get savic for 20 million

thanks