The off-contract 34-year-old has been declared by coach Maguire as a certain starter for Friday night's home clash with the Sydney Roosters.
Reynolds starred in a 46-24 win over Wests Tigers before leaving the field in the 45th minute with hamstring tightness.
The 2014 premiership winner intends to play on next year and the Broncos are in the midst of a salary cap juggle to keep him.
Maguire said he had not planned the cap management around this being Reynolds' last in the NRL.
"It has never been my case of thinking that he retires. If you are playing well you keep on going," Maguire said.
"He has been around to know that when you are having conversations with an organisation they are ongoing.
"The game has shown that the older boys are still doing great things.
"I want (to keep) everyone that is here and we have got to work around that. Every club is going through various salary cap decisions and we are no different. We have close conversations with all our players."
Not only is the Broncos maestro in top form through five rounds, the narratives around him being allegedly injury-prone are misguided.
He has played at least 20 games in 10 of his completed 13 seasons. Last year the 293-game veteran missed 11 matches due to a biceps contact injury, not through breaking down.
"You are definitely right about Reyno with the myth. Some time ago people thought he was finished and he has definitely proved that is not the case," Maguire said.
"Last year he obviously faced a bit of adversity but every player goes through it at some stage. He is getting close to his 300 in the next months so that says a lot about where Reyno is at."
Maguire said Reynolds continuing on would be no impediment for other squad halves Coby Black and Jock Madden.
"Coby is young, he is at the start and has the best seat in the house, same with Jock, when you are learning with (Reynolds and Ben Hunt) in front of you," he said.
"I have a really big opinion of Jock. I have had him a few years ago when he first progressed into playing NRL at the Wests Tigers, but when you have two players like that, you just become a sponge.
"One who has played nearly 350 games and one who is nearly at 300 in Reyno."
Maguire said there were no issues around Reynolds' hamstring on match eve.
"He is playing. He trained well two days and we will have a captain's run today. He will be up and about," Maguire said.
"It is one we have obviously got to manage and monitor but the medical staff here are really strong on what they know and how they have dealt with Reyno so he is good to go."
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