The phrase "settled squad" means a group or team of people that has been established and organized for a while, without many changes or disruptions. Full definition
Settled squad of quality players, and top class goalkeepers. (justarsenal.com)
I think we need to re evaluate our approach to transfer windows, having in mind a clear vision as to what we need and who's available, get business done early and look at tactics while having a fit settled squad. (justarsenal.com)
The last 5 PL winners (and probably soon to be 6 with Chelsea this year) have been with lightly tweaked but essentially settled squads / teams on the back of 5 - 10 years of heavy investment. (justarsenal.com)