Testing all the things

Tierney, who has been restricted to nine appearances this year, has won four league titles, two Scottish Cups and two League Cups for Celtic.

The news of Celtic's rebuff came as a group of influential Arsenal supporters' organisations, fanzines and blogs joined forces to call for "better leadership" of the club and hit out at Stan Kroenke's "passive ownership".

A total of 16 signatories published a statement on Monday morning demanding change as the Gunners prepare for a third season without Champions League football.