Hard to speculate in terms of how much we'll spend, but since last summer, there has been the unexpected bonus of Euro money, substantial increase in value of a number of players, and Ryan Kent showing that players can come to Rangers on loan, improve and themselves go up in value.
Pedro Caixinha had 1 window and a net spend of around £6m on players.
Gerrard has far more trust from the board, and could generate a few million from selling squad players alone - I think that's his plan - generating money for squad players and replacing those squad players with better quality bosmans (Jones, Stewart, and there'll be more + loans).
If we can keep all first XI players from this season, I think a net spend of £6m-£10m (less than what we earned from the Europa League run), plus whatever is generated from the sale of squad players is realistic. That could be over £10m to be spent on a quality centre back, centre mid and goalscoring winger, with backups/the odd key player also to be brought in on loan.