The manager insists that it is still not decided which surgical route will be taken with Gus, who injured his knee in the pre-season friendly at Gillingham.
Reports in the morning newspapers suggesting Gus broke down in training on Tuesday are inaccurate.
"Gus didn't break down on Tuesday, he wasn't training, I don't know where that's come from," said Glenn at Spurs Lodge today.
"We're still looking at it. We feel that the Meniscus will need to be operated on, which is just keyhole surgery.
"The next thing to determine is whether there is something else in the knee that needs to be sorted out or whether we can rehab him.
"We might get him back within three months if we can rehab him, if everything goes well with the miniscus.
"That's what we're looking at and in the next few days we'll decide what we actually do. I will discuss it with Gus and the decision will be made between myself and him as to which way we go forward.
"The last thing we really want to do it open the knee up and operate on it. We're seeking other options at the moment and it will be interesting to see how it develops.
"I think he'll have to have the keyhole surgery, but what he's done is two weeks of solid work on the muscle because that is the important thing after a Meniscus. Sometimes you can go into surgery quickly without a strong muscle and it can take you longer afterwards.
"The work that he's been doing will stand him in good stead for after the operation. It's a little bit of a different way of working but it is something we feel could work for us."
Glenn says reports of Gus being out of action for eight months are the very worst case scenario.
"They are the very worst case, I would say three months, possibly six if he has an operation. If he doesn't the test is after three months when he comes to playing and whether the knee can hold up to it.
"It's the same thing after an operation, you have to rehabilitate the muscles under the knee and that would be no different whichever way we look at things.
"I'm hoping he doesn't have to have full-blown surgery, but on that we'll wait and see."
Glenn says reports that Gus Poyet will be out for eight months with cruciate ligament damage are premature and maintains that the midfielder could still return in between three to six months.