Glover threw two flares before the pitch invasion that resulted in the abandonment of the December 17 A-League Men clash with Melbourne Victory, including one that went back into the Victory active support area.
He was cleared to play Central Coast after recovering from concussion and a facial laceration suffered when he was hit by a metal bucket wielded by a pitch invader when Victory fans stormed the AAMI Park surface.
Glover did not face a suspension from Football Australia for throwing flares as an independent match review panel determined they didn't have jurisdiction to assess the incident, as it was considered dealt with by match officials on the night.
Montgomery was bemused to see the former Olyroos custodian between the sticks in City's 1-0 win over his charges at AAMI Park on Tuesday night, including making an important late save to deny Michael Ruhs.
"How he's playing I'll never know. I don't think anyone expected him to play today after what happened last week. But he did and he pulled off a great save and he saves them two points," Montgomery told reporters.
"Throwing a firework (flare) back in a crowd of people. I think all the talk after was that he would be suspended, and I actually thought he would be.
"I don't want people suspended but, again, he's a good keeper and he's saved them two points tonight.
"Not saying I don't want people to play but concussion and throwing a firework?
"But I like Tommy, he's a great kid. But I told him after, I had a laugh with him after, and said 'you must be the only person who can throw a firework and not get suspended'."
City interim coach Rado Vidosic said the club didn't believe Glover had deserved a suspension.
"In those situations, you never know what's going to happen," he told reporters.
"But we don't believe that he did anything wrong and the decision is correct."
Vidosic praised Glover's response to his traumatising derby experience.
"He probably got more counseling from the club than anyone else because he was impacted more than anyone else," he said.
"But he was excellent throughout the week. He was always with the players and he only trained the last few days with the group.
"But I think he was excellent today. Spotless, perfect, clean sheet for him - and he loved that."
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