Collymore obviously has contacts across the footballing world, and the reports he has heard back on Barkley are not all positive.
The TalkSPORT pundit suggests that coaches who have previously worked with the attacking midfielder suggest that he can only perform instinctively, and struggles to react to situations going on around him.
"I’ve heard from coaches who’ve worked with him [Barkley] for a number of years at all levels that he’s got talent but no football brain that can adapt to differing situations on the pitch," Collymore wrote.
"In other words it’s all off-the-cuff and when that doesn’t work then he becomes a liability."
Barkley had arguably his best season for Everton last campaign, but he failed to make an impact at Euro 2016.
Barkley was kept on the substitutes’ bench throughout the entirety of England’s unsuccessful campaign in France.
Barkley’s persistent omission has been criticised by some observers, as England desperately lacked creativity throughout the tournament.
The Three Lions struggled in the group stages, and then put in a woeful performance against Iceland last night - as they slumped to a 2-1 defeat.