Middlesbrough had a productive 2024 summer transfer window that has seen their squad value increase. All told, Michael Carrick brought nine new faces to the Riverside Stadium during the most recent transfer window. There were a few signings who technically cost the club nothing, including free transfer Luke Ayling. Deadline day additions Ben Doak and George Edmundson have moved to Middlesbrough on loan as well, so they technically have no transfer fee. The remaining six first-team additions at the club this summer were all permanent deals though, and set Boro back a decent chunk of change. Mid…