Borna Barisic insists Rangers pal Calvin Bassey has the mental fortitude to improve even further at Ibrox.
And the brains pairs well with his considerable brawn as Bassey has emerged as a stick-on starter in Light Blue.
Gio van Bronckhorst is a huge fan of the Nigerian international, who has fitted between left-back and centre-back so far this season having been signed from Leicester City by Steven Gerrard last summer.
