Craig, who hung up his gloves earlier this week, made the decision not to play on this summer after spending most of last season recovering from testicular cancer.
"He has done an excellent job and gave great service to the two clubs he has worked for, Ipswich and West Ham," says Glenn.
"He is a fantastic club man and anyone who has ever worked around Craig Forrest only has good words to say about him.
"I have worked with him and he is a coach's dream, so it is a shame he has had to retire.
"But we were told he has been cured, he will hopefully live a long life now, and I am sure if there is anything we can do to help him, West Ham will.
"When you are in the situation he was in with the cancer, football is not quite so important, and he goes with our best wishes."
Glenn confirms that he is happy with the goalkeeping situation at the club, despite the fact that senior keepers Craig, his short term replacement Sven Andersson, and Shaka Hislop have left, while Steve Bywater is out for three months with an injured wrist.
"With David James and Raimond van der Gouw we are happy with the keeper situation. Rai looks incredibly fit and agile for someone of 39," says Glenn, "and we also have young keeper David Forde.
"If we have to use Rai we have every confidence in him, but - and Rai understands this - we hope we don't because that means David James would be injured."
*If you want to make a donation to the Orchid Trust, which Craig supports, you can call 020 7601 7808. The charity concerns itself with testicular and prostate cancer.