Les, who initially signed on a short term contract when he arrived from Spurs in January, opted to play on another year, saying he did not want his career to end on a relegation.
Unfortunately for Glenn, Southampton, Leicester, and Wolves all made offers and he chose to go to the newly promoted Foxes.
"I think Les initially would have liked to have stayed at West Ham but the fact of the matter was he had three offers to stay in the Premiership for one more year before he retires and overall the lure of that was very big for him," says Glenn.
"I would still have liked to have had him in the squad because when he came to the club he gave us something, not just on the field but off it as well.
"But now we must move forward."
As for Glen Johnson's departure to Chelsea, Glenn adds:
"Glen is a very young talent and I am sure he is destined to go on to some very great things in his career.
"He has already made giant strides in the short time he has been in our first team."