Sam Allardyce left his role as the Three Lions manager on Tuesday by mutual consent after a Daily Telegraph investigation accused him of offering advice on how to get around FA rules on player transfers.
Glenn told reporters: “Sam is absolutely distraught. He recognises that he made a terrible error of judgement and I think that he recognises as well that, whilst it’s a tough decision that the FA is taking, he can see that at least we have a point.
“Once again, I have to say how personally disappointed I am. I thought Sam had already made a big difference to the FA – he came to St. George’s Park and showed real leadership there and had clear enthusiasm for the job at hand.
“I know personally that he is deeply, deeply upset and deeply regrets the error of judgement but I also think that he understands why the FA has had to take this tough decision.”