Les jumped and landed awkwardly on the same ankle that caused him to miss the Worthington Cup victory over Fulham and the scorer of our second goal was helped from the pitch by the physios after the game.
"Les has unfortunately twisted his ankle," reported Glenn. "We'll have to see how he is tomorrow after he's had a scan.
"He's had a slight problem with it this week and it happened with jumping and landing. It doesn't look very good at the moment, but at least I saw him walking in the changing room after it had been iced down.
"He did not need to be put in a cast or whatever."
Asked how long Les is likely to be out of action for, Glenn responded: "We're not sure he's going to be out, it's really to soon to say.
"It's always a nasty injury when you land and twist, but that fact that I've seen him walking without crutches is a good sign.
"I would say that it might need a week, no more, to settle down."
Glenn estimates that Les Ferdinand will be out for about a week with an ankle injury sustained in the closing stages of the win over Bolton.